J/A+A/638/A21ivo://CDS.VizieR/J/A+A/638/A21doi:10.26093/cds/vizier.36380021CDSVioque M.Oudmaijer R.D.Schreiner M.Mendigutia I.Baines D.,Mowlavi N.Perez-Martinez R.2021-02-18T07:05:01Z2020-06-04T07:03:51ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frbe-starsemission-line-starspre-main-sequence-starsphotometryThe intermediate-mass pre-main sequence (PMS) Herbig Ae/Be stars are key to understanding the differences in formation mechanisms between low- and high-mass stars. The study of the general properties of these objects is hampered by the lack of a well-defined, homogeneous sample, and because few and mostly serendipitously discovered sources are known. Our goal is to identify new Herbig Ae/Be candidates to create a homogeneous and well defined catalogue of these objects. We have applied machine learning techniques to 4150983 sources with data from Gaia DR2, 2MASS, WISE, and IPHAS or VPHAS+. Several observables were chosen to identify new Herbig Ae/Be candidates based on our current knowledge of this class, which is characterised by infrared excesses, photometric variabilities, and Halpha emission lines. Classical techniques are not efficient for identifying new Herbig Ae/Be stars mainly because of their similarity with classical Be stars (CBe), with which they share many characteristics. By focusing on disentangling these two types of objects, our algorithm has also identified new classical Be stars. We have obtained a large catalogue of 8470 new pre-main sequence candidates and another catalogue of 693 new classical Be candidates with a completeness of 78.8+/-1.4% and 85.5+/-1.2%, respectively. Of the catalogue of pre-main sequence candidates, at least 1361 sources are potentially new Herbig Ae/Be candidates according to their position in the Hertzsprung-Russell diagram. In this study we present the methodology used, evaluate the quality of the catalogues, and perform an analysis of their flaws and biases. For this assessment, we make use of observables that have not been accounted for by the algorithm and hence are selection-independent, such as coordinates and parallax based distances. The catalogue of new Herbig Ae/Be stars that we present here increases the number of known objects of the class by an order of magnitude.2020A&A...638A..21Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/638/A21CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration,, 2018)II/328 : AllWISE Data Release (Cutri+ 2013)II/321 : IPHAS DR2 Source Catalogue (Barentsen+, 2014)II/341 : VPHAS+ DR2 survey (Drew+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/638/A21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/638/A21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/638/A21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/638/A21https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/638/A21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/638/A21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/638/A21/pms (Pre-main sequence candidates (table D1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/638/A21/pms?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/638/A21/pms?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/638/A21/pms?GETtext/xml+votable180.050000true0.003730013851163.67909024249610.005555555555555556Cone search capability for table J/A+A/638/A21/cbe (Classical Be candidates (table D2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/638/A21/cbe?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/638/A21/cbe?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/638/A21/cbe?GETtext/xml+votable180.050000true0.079799424616461.15364583888650.005555555555555556Cone search capability for table J/A+A/638/A21/either (*Sources that have a probability p(PMS)+p(CBe)>50% but p(PMS)<50%, and p(CBe)<50%)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/638/A21/either?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/638/A21/either?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/638/A21/either?GETtext/xml+votable180.050000true0.251660767655160.44600830258580.005555555555555556Cone search capability for table J/A+A/638/A21/sample (*All sources considered in this study with assigned probabilities of belonging to each of the three categories (PMS, CBe, and other))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/638/A21/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/638/A21/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/638/A21/sample?GETtext/xml+votable180.050000true0.00014401065862.34500887622150.0055555555555555563/20 22 223 225 228-229 240 347 380 382 450 478 4/84 109 111-114 120 122 189-191 197-199 203-206 208 225-228 232 810-811 814 875 878-879 890-891 896-897 964-966 976-977 980 1379 1382 1385 1476-1477 1479 1485 1487 1490 1496 1498 1534 1807 1844-1845 1889 1891 1894-1895 1897 1900-1901 1916 1918-1919 2005 2333 2370 2453 2485 2487 2652-2653 5/344-346 368 370 376 407 413 415 443 460 462 484 486 733 735 750-751 755 785-787 805 807 828-830 840 842 897-899 916 920-922 932-934 936-938 3234-3235 3238 3260 3262-3263 3306-3307 3310-3311 3322-3323 3326-3327 3498-3499 3511 3547 3549-3551 3554-3555 3557-3559 3592-3593 3596-3597 3599 3680-3681 3684-3685 3696 3868-3870 3912-3913 3916-3917 3924-3925 3928 5205 5376 5378 5381-5382 5384-5385 5387 5390 5409-5411 5413 5416-5417 5420 5422 5509 5511 5523 5526 5532 5534 5549 5551 5608 5610 5912-5913 5915 5937 5939 5952 5954-5955 5966 5988 5990 5996 5998-5999 6036-6037 6039 6045 6047 6069 6098 6104 6106 6128 6130 7216 7218-7219 7222-7225 7266 7272 7274-7275 7278-7279 7290 7365 7553-7555 7561 7570-7571 7574 7609 7612-7613 7624 7626-7627 7630-7631 7668 7670-7671 8004-8005 8016-8017 8019 9307 9309-9311 9341 9343 9429-9432 9436 9438 9460 9462 9467-9468 9470 9473-9476 9478 9504 9506-9507 9610 9809 9811 9817-9820 9822 9841 9843-9844 9846-9847 9849 9851-9852 9854 9937 9945-9947 9969 9972-9973 9975 9980-9981 9983 10114 10153-10154 10366-10367 10396 10399 10407 10413-10414 10418-10422 10424 10439-10440 10442 10449-10451 10453-10454 10456 10541-10543 10551-10553 10590 10594-10595 10597-10600 10621 10624 10753-10756 10758 10760 6/1109 1111 1119 1141 1237 1269 1271 1277 1279 1388-1390 1476 1478 1512 1514 1621-1623 1649 1651 1657-1659 1743 1765-1767 1771 1844-1846 1852 1854 1856 1858 1968 1970 1976 2911 2937-2939 2991 2997-2999 3013-3015 3017-3019 3127 3133-3135 3137 3139 3219 3225-3227 3239 3245-3247 3324-3326 3364 3456-3458 3464 3466 3585 3587 3668 3672-3674 3692 3694 3696 3740-3742 3756-3758 3760-3762 3776-3778 12930-12931 12958-12959 13002 13044 13046-13047 13218-13219 13222-13223 13234-13235 13238-13239 13282-13283 13286-13287 13298-13299 13302-13303 13986-13987 13989-13991 14026-14027 14030-14031 14042-14043 14143 14175 14186-14187 14194-14195 14214-14215 14225-14227 14381 14392-14393 14532-14533 14544-14545 14548-14549 14551 14788-14790 14800-14801 14804-14805 15484-15486 15488-15489 15492-15493 15504-15505 15656-15657 15660-15661 15672-15673 15704-15706 15708-15709 15716-15717 20828-20829 20831 20853 20855 20957 20959 20981 21510 21516 21518-21519 21523 21532 21545 21547 21554-21555 21567 21610 21633-21635 21648 21650 21656 21658-21659 21673 21676-21677 21679 21686 21692 21696 22035 22040-22041 22043 22055 22061 22063 22088 22090-22091 22132 22134 22140 22142 22193 22402 22408 22410 22446 23573 23575 23581 23657 23659 23745 23781 23783 23789 23812 23814-23815 23856 23858 23964 23966 23988 23990-23991 24153 24155 24177 24179 24284-24285 24287 24309 24311 24317 24319 24384 24386 24430 24516 24518 24524 24526 28715 28718-28719 28730-28731 28734 28868 28870-28871 28881-28883 28886 28904-28905 28907-28909 28911 29058-29059 29094-29095 29106-29107 29110 29164 29166-29167 29178-29179 29182 29184 29188-29189 29200-29202 29440-29441 29444-29445 29456-29457 29459 29468-29469 29471 29493 29536-29537 29540-29541 29552-29553 29556-29557 29871 29882-29883 30210-30211 30240-30242 30253 30272 30274-30275 30278-30279 30302-30303 30389 30432-30433 30457 30460-30461 30463 30500 30502-30503 30514-30515 30570-30571 30574 30678-30679 32001 32004-32005 32029 32072-32073 32075 32112-32113 32116-32117 32119 37213-37215 37223 37234-37235 37316-37317 37319 37325 37327 37361 37363 37369 37371 37687 37707-37708 37710-37711 37713-37715 37732-37733 37735-37736 37743 37748 37756 37758-37759 37829 37831 37837 37839 37844-37846 37854 37861-37863 37876 37878 37886-37887 37889-37891 37908 37910 37916 37936 37944 38020 38022-38023 38033-38036 38038 38040-38042 38048-38050 38056 38435-38436 38438 38444 38528 38570 39231 39235 39265 39267 39284 39317 39360-39361 39363 39369 39371 39395 39401 39412-39414 39756-39757 39759 39779 39873 39875 39896-39897 39899 39936 39938 40450 40480-40482 40591 40602-40603 40608 40610-40611 40620-40621 40624-40626 41459 41462-41463 41562-41563 41573 41575 41581 41591-41593 41595 41627 41645-41647 41649-41651 41660-41662 41666-41667 41669-41671 41692 41700-41701 41704 41712 41755 41772 41774 41777 41780-41781 41783 41795 41808 41810-41811 41820-41822 41828-41829 41856-41857 42153-42156 42158-42159 42163 42187 42190-42191 42202-42203 42216-42218 42220-42221 42224-42226 42228-42229 42231 42350-42351 42364 42366-42367 42371 42374-42375 42386-42387 42404-42405 42416-42417 42419-42420 42464-42465 42468-42469 42480-42481 42483 42500 42504 42512-42513 42515-42518 43009-43011 43028 43030-43031 43036-43038 43044-43045 43048 43056-430588.157980699529898e-21 4.851276835901009e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/638/A21?format=asciidefaultJ/A+A/638/A21/pmsPre-main sequence candidates (table D1)RA_ICRSGaia DR2 right ascension (ICRS) at Ep=2015.5 (Gaia_ra)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 source identifier, Cat. I/345 (Gaia_source_id)meta.id;meta.mainDE_ICRSGaia DR2 declination (ICRS) at Ep=2015.5 (Gaia_dec)degpos.eq.dec;meta.mainGLON[] Gaia DR2 Galactic longitude (l)degpos.galactic.lonGLATGaia DR2 Galactic latitude (b)degpos.galactic.latdoublepPMSProbability of belonging to the pre-main sequence class (Probability_PMS)stat.fit.goodnessfloate_pPMSError of the Probability PMS (e_Probability_PMS)stat.errorfloatpCBeProbability of belonging to the classical Be class (Probability_CBe)stat.fit.goodnessfloate_pCBeError of the Probability CBe (e_Probability_CBe)stat.errorfloatpOtherProbability of belonging to the 'other objects' class (Probability_Other)stat.fit.goodnessfloate_pOtherError of the Probability Other (e_Probability_Other)stat.errorfloatVhtgHeterogeneous variability (Equation 2) (V_htg)src.var.indexdoubleGvarG band variability proxy (Equation 1) (G_var)src.var.indexfloatBPmagGaia DR2 blue band (0.50 microns) magnitude (G_BP)magphot.mag;em.opt.BfloatGmagGaia DR2 G (white) band (0.59 microns) magnitude (G)magphot.mag;em.optfloatRPmagGaia DR2 red band (0.77 microns) magnitude (G_RP)magphot.mag;em.opt.RfloatIVPHASIPHAS (Cat. II/321) or VPHAS+ (Cat. II/341) catalogue name (IPHAS/VPHAS_name)meta.idcharrmagIPHAS or VPHAS+ r band (0.62 microns) magnitude (r)magphot.mag;em.opt.Rfloate_rmagError of IPHAS or VPHAS+ r band magnitude (e_r)magstat.error;phot.magfloatimag? IPHAS or VPHAS+ i band (0.77 microns) magnitude (i)magphot.mag;em.opt.Ifloatnullablee_imag? Error of IPHAS or VPHAS+ i band magnitude (e_i)magstat.error;phot.magfloatnullableHamagIPHAS or VPHAS+ Halpha band (0.66 microns) magnitude (Halpha)magphot.mag;em.line.Halphafloate_HamagError of IPHAS or VPHAS+ Halpha band magnitude (e_Halpha)magstat.error;em.line.Halphafloata10p[0/1] 'a10point' quality flag from IPHAS or 'clean' quality flag from VPHAS+ (a10point)meta.code.qualcharDist1Angular distance from the IPHAS or VPHAS+ source to the Gaia source (angDist_IPHAS_VPHAS)arcsecpos.angDistancedoubleAllWISEAllWISE catalogue name (Cat. II/328) (AllWISE_name)meta.idcharJmag2MASS J band magnitude from AllWISE (1.24 microns) (Jmag)magphot.mag;em.IR.Jfloate_JmagError of 2MASS J band magnitude from AllWISE (e_Jmag)magstat.error;phot.magfloatHmag2MASS H band magnitude from AllWISE (1.66 microns) (Hmag)magphot.mag;em.IR.Hfloate_HmagError of 2MASS H band magnitude from AllWISE (e_Hmag)magstat.error;phot.magfloatKsmag2MASS Ks band magnitude from AllWISE (2.16 microns) (Kmag)magphot.mag;em.IR.Kfloate_KsmagError of 2MASS Ks band magnitude from AllWISE (e_Kmag)magstat.error;phot.magfloatW1magWISE W1 band magnitude from AllWISE (3.4 microns) (W1mag)magphot.mag;em.IR.3-4umfloate_W1magError of WISE W1 band magnitude from AllWISE (e_W1mag)magstat.error;phot.magfloatW2magWISE W2 band magnitude from AllWISE (4.6 microns) (W2mag)magphot.mag;em.IR.4-8umfloate_W2magError of WISE W2 band magnitude from AllWISE (e_W2mag)magstat.error;phot.magfloatW3magWISE W3 band magnitude from AllWISE (12 microns) (W3mag)magphot.flux.density;em.IR.8-15umfloate_W3magError of WISE W3 band magnitude from AllWISE (e_W3mag)magstat.error;phot.magfloatW4magWISE W4 band magnitude from AllWISE (22 microns) (W4mag)magphot.flux.density;em.IR.15-30umfloate_W4magError of WISE W4 band magnitude from AllWISE (e_W4mag)magstat.error;phot.magfloatccfAllWISE contamination and confusion flag (ccf)meta.codecharexAllWISE extended source flag (ex)meta.codecharvarAllWISE variability flag (var)meta.code;src.varcharqphAllWISE photometric quality flag (qph)meta.code.qual;photcharDist2Angular distance from the AllWISE source to the Gaia source (angDist_AllWISE)arcsecpos.angDistancedoubleRUWE? Re-normalised unit weight error from Gaia DR2 (RUWE)stat.errorfloatnullablePlx? Gaia DR2 parallax (Parallax)maspos.parallaxdoublenullablee_Plx? Parallax uncertainty from Gaia DR2 (e_Parallax)masstat.error;pos.parallaxdoublenullableDist? Distance from parallax (Distance) (1)pcpos.distancedoublenullableE_Dist? Upper error on the Distance (E_Distance)pcstat.error;stat.maxdoublenullablee_Dist? Lower error on the Distance (e_Distance)pcstat.errordoublenullableAG? Interstellar extinction in the G bandi (A_G_intst) (2)magphys.absorption.galfloatnullableGMAG? Absolute G magnitude corrected from interstellar extinction using AG (M_G)magphys.magAbsfloatnullableBP-RP? G_BP-G_RP colour corrected from interstellar extinction using AG (G_BP_G_RP)magphot.color;em.opt.B;em.opt.RfloatnullableHAeBe[Yes ] Yes if Herbig Ae/Be candidate, only in pms.dat file (HAeBe) (3)meta.codecharGUMAP[G_UMAP ] G_UMAP if possible evolve star contaminant, nothing otherwise, only in pms.dat and either.dat (Flag_G_UMAP) (4)meta.codecharIDAllW[ID AllW] 'ID AllW' if this source have the same AllWISE name than other source in the sample.dat, nothing otherwise, not in sample.dat (Flag_ID_AllW) (5)meta.codecharIDIPH[ID IPH/VPH] 'ID IPH/VPH' if this source have the same IPHAS or VPHAS+ name than other source in the sample.dat, nothing otherwise, not in sample.dat (Flag_ID_IPH/VPH) (6)meta.codecharFPN[PN ] 'PN' if possible Planetary Nebula or 'unclassified B[e]' contaminant, nothing otherwise (Flag_PN) (7)meta.codecharFVar[Var ] 'Var' if photometrically variable PMS candidate (Flag_Var) (8)meta.codecharFW3W4[W3W4 ] 'W3W4' if extended source flag of AllWISE catalogue is different of 0, nothing otherwise (Flag_W3W4) (9)meta.codecharFX-mtch[X-mtch -] 'X-mtch' if likely false candidate because of incorrect cross-match with IPHAS or VPHAS+, nothing otherwise, not in sample.dat (Flag_X-mtch) (10)meta.codecharpmRA*? Gaia DR2 proper motion in right ascension, pmRA*cosDE (pmra)mas/yrpos.pm;pos.eq.radoublenullablee_pmRA*? Error of pmra from Gaia DR2 (pmra_error)mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Gaia DR2 proper motion in declination (pmdec)mas/yrpos.pm;pos.eq.decdoublenullablee_pmDE? Error of pmdec from Gaia DR2 (pmdec_error)mas/yrstat.error;pos.pm;pos.eq.decfloatnullablee_FGGaia DR2 Error of G band in flux (phot_g_mean_flux_error)stat.error;phot.flux;stat.meandoublee_FBPGaia DR2 Error of G_BP band in flux (phot_bp_mean_flux_error)stat.error;phot.flux;stat.meandoublee_FRPGaia DR2 Error of G_RP band in flux (phot_rp_mean_flux_error)stat.error;phot.flux;stat.meandoubleE(BR/RP)Gaia DR2 colour excess factor quality flag (phot_bp_rp_excess_factor)phot.color.excessfloatRV? Gaia DR2 spectroscopic radial velocity (radial_velocity)km/sphys.veloc;pos.heliocentricfloatnullablee_RV? Error of RV from Gaia DR2 (radial_velocity_error)km/sstat.errorfloatnullable_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexedJ/A+A/638/A21/cbeClassical Be candidates (table D2)RUWE? Re-normalised unit weight error from Gaia DR2 (RUWE)stat.errorfloatnullableGvarG band variability proxy (Equation 1) (G_var)src.var.indexfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 source identifier, Cat. I/345 (Gaia_source_id)meta.id;meta.mainRA_ICRSGaia DR2 right ascension (ICRS) at Ep=2015.5 (Gaia_ra)degpos.eq.ra;meta.mainDE_ICRSGaia DR2 declination (ICRS) at Ep=2015.5 (Gaia_dec)degpos.eq.dec;meta.mainGLON[] Gaia DR2 Galactic longitude (l)degpos.galactic.lonGLATGaia DR2 Galactic latitude (b)degpos.galactic.latdoublepPMSProbability of belonging to the pre-main sequence class (Probability_PMS)stat.fit.goodnessfloate_pPMSError of the Probability PMS (e_Probability_PMS)stat.errorfloatpCBeProbability of belonging to the classical Be class (Probability_CBe)stat.fit.goodnessfloate_pCBeError of the Probability CBe (e_Probability_CBe)stat.errorfloatpOtherProbability of belonging to the 'other objects' class (Probability_Other)stat.fit.goodnessfloate_pOtherError of the Probability Other (e_Probability_Other)stat.errorfloatVhtgHeterogeneous variability (Equation 2) (V_htg)src.var.indexdoubleBPmagGaia DR2 blue band (0.50 microns) magnitude (G_BP)magphot.mag;em.opt.BfloatGmagGaia DR2 G (white) band (0.59 microns) magnitude (G)magphot.mag;em.optfloatRPmagGaia DR2 red band (0.77 microns) magnitude (G_RP)magphot.mag;em.opt.RfloatIVPHASIPHAS (Cat. II/321) or VPHAS+ (Cat. II/341) catalogue name (IPHAS/VPHAS_name)meta.idcharrmagIPHAS or VPHAS+ r band (0.62 microns) magnitude (r)magphot.mag;em.opt.Rfloate_rmagError of IPHAS or VPHAS+ r band magnitude (e_r)magstat.error;phot.magfloatimag? IPHAS or VPHAS+ i band (0.77 microns) magnitude (i)magphot.mag;em.opt.Ifloatnullablee_imag? Error of IPHAS or VPHAS+ i band magnitude (e_i)magstat.error;phot.magfloatnullableHamagIPHAS or VPHAS+ Halpha band (0.66 microns) magnitude (Halpha)magphot.mag;em.line.Halphafloate_HamagError of IPHAS or VPHAS+ Halpha band magnitude (e_Halpha)magstat.error;em.line.Halphafloata10p[0/1] 'a10point' quality flag from IPHAS or 'clean' quality flag from VPHAS+ (a10point)meta.code.qualcharDist1Angular distance from the IPHAS or VPHAS+ source to the Gaia source (angDist_IPHAS_VPHAS)arcsecpos.angDistancedoubleAllWISEAllWISE catalogue name (Cat. II/328) (AllWISE_name)meta.idcharJmag2MASS J band magnitude from AllWISE (1.24 microns) (Jmag)magphot.mag;em.IR.Jfloate_JmagError of 2MASS J band magnitude from AllWISE (e_Jmag)magstat.error;phot.magfloatHmag2MASS H band magnitude from AllWISE (1.66 microns) (Hmag)magphot.mag;em.IR.Hfloate_HmagError of 2MASS H band magnitude from AllWISE (e_Hmag)magstat.error;phot.magfloatKsmag2MASS Ks band magnitude from AllWISE (2.16 microns) (Kmag)magphot.mag;em.IR.Kfloate_KsmagError of 2MASS Ks band magnitude from AllWISE (e_Kmag)magstat.error;phot.magfloatW1magWISE W1 band magnitude from AllWISE (3.4 microns) (W1mag)magphot.mag;em.IR.3-4umfloate_W1magError of WISE W1 band magnitude from AllWISE (e_W1mag)magstat.error;phot.magfloatW2magWISE W2 band magnitude from AllWISE (4.6 microns) (W2mag)magphot.mag;em.IR.4-8umfloate_W2magError of WISE W2 band magnitude from AllWISE (e_W2mag)magstat.error;phot.magfloatW3magWISE W3 band magnitude from AllWISE (12 microns) (W3mag)magphot.flux.density;em.IR.8-15umfloate_W3magError of WISE W3 band magnitude from AllWISE (e_W3mag)magstat.error;phot.magfloatW4magWISE W4 band magnitude from AllWISE (22 microns) (W4mag)magphot.flux.density;em.IR.15-30umfloate_W4magError of WISE W4 band magnitude from AllWISE (e_W4mag)magstat.error;phot.magfloatccfAllWISE contamination and confusion flag (ccf)meta.codecharexAllWISE extended source flag (ex)meta.codecharvarAllWISE variability flag (var)meta.code;src.varcharqphAllWISE photometric quality flag (qph)meta.code.qual;photcharDist2Angular distance from the AllWISE source to the Gaia source (angDist_AllWISE)arcsecpos.angDistancedoublePlx? Gaia DR2 parallax (Parallax)maspos.parallaxdoublenullablee_Plx? Parallax uncertainty from Gaia DR2 (e_Parallax)masstat.error;pos.parallaxdoublenullableDist? Distance from parallax (Distance) (1)pcpos.distancedoublenullableE_Dist? Upper error on the Distance (E_Distance)pcstat.error;stat.maxdoublenullablee_Dist? Lower error on the Distance (e_Distance)pcstat.errordoublenullableAG? Interstellar extinction in the G bandi (A_G_intst) (2)magphys.absorption.galfloatnullableGMAG? Absolute G magnitude corrected from interstellar extinction using AG (M_G)magphys.magAbsfloatnullableBP-RP? G_BP-G_RP colour corrected from interstellar extinction using AG (G_BP_G_RP)magphot.color;em.opt.B;em.opt.RfloatnullableHAeBe[Yes ] Yes if Herbig Ae/Be candidate, only in pms.dat file (HAeBe) (3)meta.codecharGUMAP[G_UMAP ] G_UMAP if possible evolve star contaminant, nothing otherwise, only in pms.dat and either.dat (Flag_G_UMAP) (4)meta.codecharIDAllW[ID AllW] 'ID AllW' if this source have the same AllWISE name than other source in the sample.dat, nothing otherwise, not in sample.dat (Flag_ID_AllW) (5)meta.codecharIDIPH[ID IPH/VPH] 'ID IPH/VPH' if this source have the same IPHAS or VPHAS+ name than other source in the sample.dat, nothing otherwise, not in sample.dat (Flag_ID_IPH/VPH) (6)meta.codecharFPN[PN ] 'PN' if possible Planetary Nebula or 'unclassified B[e]' contaminant, nothing otherwise (Flag_PN) (7)meta.codecharFVar[Var ] 'Var' if photometrically variable PMS candidate (Flag_Var) (8)meta.codecharFW3W4[W3W4 ] 'W3W4' if extended source flag of AllWISE catalogue is different of 0, nothing otherwise (Flag_W3W4) (9)meta.codecharFX-mtch[X-mtch -] 'X-mtch' if likely false candidate because of incorrect cross-match with IPHAS or VPHAS+, nothing otherwise, not in sample.dat (Flag_X-mtch) (10)meta.codecharpmRA*? Gaia DR2 proper motion in right ascension, pmRA*cosDE (pmra)mas/yrpos.pm;pos.eq.radoublenullablee_pmRA*? Error of pmra from Gaia DR2 (pmra_error)mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Gaia DR2 proper motion in declination (pmdec)mas/yrpos.pm;pos.eq.decdoublenullablee_pmDE? Error of pmdec from Gaia DR2 (pmdec_error)mas/yrstat.error;pos.pm;pos.eq.decfloatnullablee_FGGaia DR2 Error of G band in flux (phot_g_mean_flux_error)stat.error;phot.flux;stat.meandoublee_FBPGaia DR2 Error of G_BP band in flux (phot_bp_mean_flux_error)stat.error;phot.flux;stat.meandoublee_FRPGaia DR2 Error of G_RP band in flux (phot_rp_mean_flux_error)stat.error;phot.flux;stat.meandoubleE(BR/RP)Gaia DR2 colour excess factor quality flag (phot_bp_rp_excess_factor)phot.color.excessfloatRV? Gaia DR2 spectroscopic radial velocity (radial_velocity)km/sphys.veloc;pos.heliocentricfloatnullablee_RV? Error of RV from Gaia DR2 (radial_velocity_error)km/sstat.errorfloatnullable_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexedJ/A+A/638/A21/either*Sources that have a probability p(PMS)+p(CBe)>50% but p(PMS)<50%, and p(CBe)<50%e_W1magError of WISE W1 band magnitude from AllWISE (e_W1mag)magstat.error;phot.magfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 source identifier, Cat. I/345 (Gaia_source_id)meta.id;meta.mainRA_ICRSGaia DR2 right ascension (ICRS) at Ep=2015.5 (Gaia_ra)degpos.eq.ra;meta.mainDE_ICRSGaia DR2 declination (ICRS) at Ep=2015.5 (Gaia_dec)degpos.eq.dec;meta.mainGLON[] Gaia DR2 Galactic longitude (l)degpos.galactic.lonGLATGaia DR2 Galactic latitude (b)degpos.galactic.latdoublepPMSProbability of belonging to the pre-main sequence class (Probability_PMS)stat.fit.goodnessfloate_pPMSError of the Probability PMS (e_Probability_PMS)stat.errorfloatpCBeProbability of belonging to the classical Be class (Probability_CBe)stat.fit.goodnessfloate_pCBeError of the Probability CBe (e_Probability_CBe)stat.errorfloatpOtherProbability of belonging to the 'other objects' class (Probability_Other)stat.fit.goodnessfloate_pOtherError of the Probability Other (e_Probability_Other)stat.errorfloatVhtgHeterogeneous variability (Equation 2) (V_htg)src.var.indexdoubleGvarG band variability proxy (Equation 1) (G_var)src.var.indexfloatBPmagGaia DR2 blue band (0.50 microns) magnitude (G_BP)magphot.mag;em.opt.BfloatGmagGaia DR2 G (white) band (0.59 microns) magnitude (G)magphot.mag;em.optfloatRPmagGaia DR2 red band (0.77 microns) magnitude (G_RP)magphot.mag;em.opt.RfloatIVPHASIPHAS (Cat. II/321) or VPHAS+ (Cat. II/341) catalogue name (IPHAS/VPHAS_name)meta.idcharrmagIPHAS or VPHAS+ r band (0.62 microns) magnitude (r)magphot.mag;em.opt.Rfloate_rmagError of IPHAS or VPHAS+ r band magnitude (e_r)magstat.error;phot.magfloatimag? IPHAS or VPHAS+ i band (0.77 microns) magnitude (i)magphot.mag;em.opt.Ifloatnullablee_imag? Error of IPHAS or VPHAS+ i band magnitude (e_i)magstat.error;phot.magfloatnullableHamagIPHAS or VPHAS+ Halpha band (0.66 microns) magnitude (Halpha)magphot.mag;em.line.Halphafloate_HamagError of IPHAS or VPHAS+ Halpha band magnitude (e_Halpha)magstat.error;em.line.Halphafloata10p[0/1] 'a10point' quality flag from IPHAS or 'clean' quality flag from VPHAS+ (a10point)meta.code.qualcharDist1Angular distance from the IPHAS or VPHAS+ source to the Gaia source (angDist_IPHAS_VPHAS)arcsecpos.angDistancedoubleAllWISEAllWISE catalogue name (Cat. II/328) (AllWISE_name)meta.idcharJmag2MASS J band magnitude from AllWISE (1.24 microns) (Jmag)magphot.mag;em.IR.Jfloate_JmagError of 2MASS J band magnitude from AllWISE (e_Jmag)magstat.error;phot.magfloatHmag2MASS H band magnitude from AllWISE (1.66 microns) (Hmag)magphot.mag;em.IR.Hfloate_HmagError of 2MASS H band magnitude from AllWISE (e_Hmag)magstat.error;phot.magfloatKsmag2MASS Ks band magnitude from AllWISE (2.16 microns) (Kmag)magphot.mag;em.IR.Kfloate_KsmagError of 2MASS Ks band magnitude from AllWISE (e_Kmag)magstat.error;phot.magfloatW1magWISE W1 band magnitude from AllWISE (3.4 microns) (W1mag)magphot.mag;em.IR.3-4umfloatW2magWISE W2 band magnitude from AllWISE (4.6 microns) (W2mag)magphot.mag;em.IR.4-8umfloate_W2magError of WISE W2 band magnitude from AllWISE (e_W2mag)magstat.error;phot.magfloatW3magWISE W3 band magnitude from AllWISE (12 microns) (W3mag)magphot.flux.density;em.IR.8-15umfloate_W3magError of WISE W3 band magnitude from AllWISE (e_W3mag)magstat.error;phot.magfloatW4magWISE W4 band magnitude from AllWISE (22 microns) (W4mag)magphot.flux.density;em.IR.15-30umfloate_W4magError of WISE W4 band magnitude from AllWISE (e_W4mag)magstat.error;phot.magfloatccfAllWISE contamination and confusion flag (ccf)meta.codecharexAllWISE extended source flag (ex)meta.codecharvarAllWISE variability flag (var)meta.code;src.varcharqphAllWISE photometric quality flag (qph)meta.code.qual;photcharDist2Angular distance from the AllWISE source to the Gaia source (angDist_AllWISE)arcsecpos.angDistancedoubleRUWE? Re-normalised unit weight error from Gaia DR2 (RUWE)stat.errorfloatnullablePlx? Gaia DR2 parallax (Parallax)maspos.parallaxdoublenullablee_Plx? Parallax uncertainty from Gaia DR2 (e_Parallax)masstat.error;pos.parallaxdoublenullableDist? Distance from parallax (Distance) (1)pcpos.distancedoublenullableE_Dist? Upper error on the Distance (E_Distance)pcstat.error;stat.maxdoublenullablee_Dist? Lower error on the Distance (e_Distance)pcstat.errordoublenullableAG? Interstellar extinction in the G bandi (A_G_intst) (2)magphys.absorption.galfloatnullableGMAG? Absolute G magnitude corrected from interstellar extinction using AG (M_G)magphys.magAbsfloatnullableBP-RP? G_BP-G_RP colour corrected from interstellar extinction using AG (G_BP_G_RP)magphot.color;em.opt.B;em.opt.RfloatnullableHAeBe[Yes ] Yes if Herbig Ae/Be candidate, only in pms.dat file (HAeBe) (3)meta.codecharGUMAP[G_UMAP ] G_UMAP if possible evolve star contaminant, nothing otherwise, only in pms.dat and either.dat (Flag_G_UMAP) (4)meta.codecharIDAllW[ID AllW] 'ID AllW' if this source have the same AllWISE name than other source in the sample.dat, nothing otherwise, not in sample.dat (Flag_ID_AllW) (5)meta.codecharIDIPH[ID IPH/VPH] 'ID IPH/VPH' if this source have the same IPHAS or VPHAS+ name than other source in the sample.dat, nothing otherwise, not in sample.dat (Flag_ID_IPH/VPH) (6)meta.codecharFPN[PN ] 'PN' if possible Planetary Nebula or 'unclassified B[e]' contaminant, nothing otherwise (Flag_PN) (7)meta.codecharFVar[Var ] 'Var' if photometrically variable PMS candidate (Flag_Var) (8)meta.codecharFW3W4[W3W4 ] 'W3W4' if extended source flag of AllWISE catalogue is different of 0, nothing otherwise (Flag_W3W4) (9)meta.codecharFX-mtch[X-mtch -] 'X-mtch' if likely false candidate because of incorrect cross-match with IPHAS or VPHAS+, nothing otherwise, not in sample.dat (Flag_X-mtch) (10)meta.codecharpmRA*? Gaia DR2 proper motion in right ascension, pmRA*cosDE (pmra)mas/yrpos.pm;pos.eq.radoublenullablee_pmRA*? Error of pmra from Gaia DR2 (pmra_error)mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Gaia DR2 proper motion in declination (pmdec)mas/yrpos.pm;pos.eq.decdoublenullablee_pmDE? Error of pmdec from Gaia DR2 (pmdec_error)mas/yrstat.error;pos.pm;pos.eq.decfloatnullablee_FGGaia DR2 Error of G band in flux (phot_g_mean_flux_error)stat.error;phot.flux;stat.meandoublee_FBPGaia DR2 Error of G_BP band in flux (phot_bp_mean_flux_error)stat.error;phot.flux;stat.meandoublee_FRPGaia DR2 Error of G_RP band in flux (phot_rp_mean_flux_error)stat.error;phot.flux;stat.meandoubleE(BR/RP)Gaia DR2 colour excess factor quality flag (phot_bp_rp_excess_factor)phot.color.excessfloatRV? Gaia DR2 spectroscopic radial velocity (radial_velocity)km/sphys.veloc;pos.heliocentricfloatnullablee_RV? Error of RV from Gaia DR2 (radial_velocity_error)km/sstat.errorfloatnullable_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexedJ/A+A/638/A21/sample*All sources considered in this study with assigned probabilities of belonging to each of the three categories (PMS, CBe, and other)ccfAllWISE contamination and confusion flag (ccf)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR2Gaia DR2 source identifier, Cat. I/345 (Gaia_source_id)meta.id;meta.mainRA_ICRSGaia DR2 right ascension (ICRS) at Ep=2015.5 (Gaia_ra)degpos.eq.ra;meta.mainindexedDE_ICRSGaia DR2 declination (ICRS) at Ep=2015.5 (Gaia_dec)degpos.eq.dec;meta.mainindexedGLON[] Gaia DR2 Galactic longitude (l)degpos.galactic.lonGLATGaia DR2 Galactic latitude (b)degpos.galactic.latdoublepPMSProbability of belonging to the pre-main sequence class (Probability_PMS)stat.fit.goodnessfloate_pPMSError of the Probability PMS (e_Probability_PMS)stat.errorfloatpCBeProbability of belonging to the classical Be class (Probability_CBe)stat.fit.goodnessfloate_pCBeError of the Probability CBe (e_Probability_CBe)stat.errorfloatpOtherProbability of belonging to the 'other objects' class (Probability_Other)stat.fit.goodnessfloate_pOtherError of the Probability Other (e_Probability_Other)stat.errorfloatVhtgHeterogeneous variability (Equation 2) (V_htg)src.var.indexdoubleGvarG band variability proxy (Equation 1) (G_var)src.var.indexfloatBPmagGaia DR2 blue band (0.50 microns) magnitude (G_BP)magphot.mag;em.opt.BfloatGmagGaia DR2 G (white) band (0.59 microns) magnitude (G)magphot.mag;em.optfloatRPmagGaia DR2 red band (0.77 microns) magnitude (G_RP)magphot.mag;em.opt.RfloatIVPHASIPHAS (Cat. II/321) or VPHAS+ (Cat. II/341) catalogue name (IPHAS/VPHAS_name)meta.idcharrmagIPHAS or VPHAS+ r band (0.62 microns) magnitude (r)magphot.mag;em.opt.Rfloate_rmagError of IPHAS or VPHAS+ r band magnitude (e_r)magstat.error;phot.magfloatimag? IPHAS or VPHAS+ i band (0.77 microns) magnitude (i)magphot.mag;em.opt.Ifloatnullablee_imag? Error of IPHAS or VPHAS+ i band magnitude (e_i)magstat.error;phot.magfloatnullableHamagIPHAS or VPHAS+ Halpha band (0.66 microns) magnitude (Halpha)magphot.mag;em.line.Halphafloate_HamagError of IPHAS or VPHAS+ Halpha band magnitude (e_Halpha)magstat.error;em.line.Halphafloata10p[0/1] 'a10point' quality flag from IPHAS or 'clean' quality flag from VPHAS+ (a10point)meta.code.qualcharDist1Angular distance from the IPHAS or VPHAS+ source to the Gaia source (angDist_IPHAS_VPHAS)arcsecpos.angDistancedoubleAllWISEAllWISE catalogue name (Cat. II/328) (AllWISE_name)meta.idcharJmag2MASS J band magnitude from AllWISE (1.24 microns) (Jmag)magphot.mag;em.IR.Jfloate_JmagError of 2MASS J band magnitude from AllWISE (e_Jmag)magstat.error;phot.magfloatHmag2MASS H band magnitude from AllWISE (1.66 microns) (Hmag)magphot.mag;em.IR.Hfloate_HmagError of 2MASS H band magnitude from AllWISE (e_Hmag)magstat.error;phot.magfloatKsmag2MASS Ks band magnitude from AllWISE (2.16 microns) (Kmag)magphot.mag;em.IR.Kfloate_KsmagError of 2MASS Ks band magnitude from AllWISE (e_Kmag)magstat.error;phot.magfloatW1magWISE W1 band magnitude from AllWISE (3.4 microns) (W1mag)magphot.mag;em.IR.3-4umfloate_W1magError of WISE W1 band magnitude from AllWISE (e_W1mag)magstat.error;phot.magfloatW2magWISE W2 band magnitude from AllWISE (4.6 microns) (W2mag)magphot.mag;em.IR.4-8umfloate_W2magError of WISE W2 band magnitude from AllWISE (e_W2mag)magstat.error;phot.magfloatW3magWISE W3 band magnitude from AllWISE (12 microns) (W3mag)magphot.flux.density;em.IR.8-15umfloate_W3magError of WISE W3 band magnitude from AllWISE (e_W3mag)magstat.error;phot.magfloatW4magWISE W4 band magnitude from AllWISE (22 microns) (W4mag)magphot.flux.density;em.IR.15-30umfloate_W4magError of WISE W4 band magnitude from AllWISE (e_W4mag)magstat.error;phot.magfloatexAllWISE extended source flag (ex)meta.codecharvarAllWISE variability flag (var)meta.code;src.varcharqphAllWISE photometric quality flag (qph)meta.code.qual;photcharDist2Angular distance from the AllWISE source to the Gaia source (angDist_AllWISE)arcsecpos.angDistancedoubleRUWE? Re-normalised unit weight error from Gaia DR2 (RUWE)stat.errorfloatnullablePlx? Gaia DR2 parallax (Parallax)maspos.parallaxdoublenullablee_Plx? Parallax uncertainty from Gaia DR2 (e_Parallax)masstat.error;pos.parallaxdoublenullableDist? Distance from parallax (Distance) (1)pcpos.distancedoublenullableE_Dist? Upper error on the Distance (E_Distance)pcstat.error;stat.maxdoublenullablee_Dist? Lower error on the Distance (e_Distance)pcstat.errordoublenullableAG? Interstellar extinction in the G bandi (A_G_intst) (2)magphys.absorption.galfloatnullableGMAG? Absolute G magnitude corrected from interstellar extinction using AG (M_G)magphys.magAbsfloatnullableBP-RP? G_BP-G_RP colour corrected from interstellar extinction using AG (G_BP_G_RP)magphot.color;em.opt.B;em.opt.RfloatnullableHAeBe[Yes ] Yes if Herbig Ae/Be candidate, only in pms.dat file (HAeBe) (3)meta.codecharGUMAP[G_UMAP ] G_UMAP if possible evolve star contaminant, nothing otherwise, only in pms.dat and either.dat (Flag_G_UMAP) (4)meta.codecharIDAllW[ID AllW] 'ID AllW' if this source have the same AllWISE name than other source in the sample.dat, nothing otherwise, not in sample.dat (Flag_ID_AllW) (5)meta.codecharIDIPH[ID IPH/VPH] 'ID IPH/VPH' if this source have the same IPHAS or VPHAS+ name than other source in the sample.dat, nothing otherwise, not in sample.dat (Flag_ID_IPH/VPH) (6)meta.codecharFPN[PN ] 'PN' if possible Planetary Nebula or 'unclassified B[e]' contaminant, nothing otherwise (Flag_PN) (7)meta.codecharFVar[Var ] 'Var' if photometrically variable PMS candidate (Flag_Var) (8)meta.codecharFW3W4[W3W4 ] 'W3W4' if extended source flag of AllWISE catalogue is different of 0, nothing otherwise (Flag_W3W4) (9)meta.codecharFX-mtch[X-mtch -] 'X-mtch' if likely false candidate because of incorrect cross-match with IPHAS or VPHAS+, nothing otherwise, not in sample.dat (Flag_X-mtch) (10)meta.codecharpmRA*? Gaia DR2 proper motion in right ascension, pmRA*cosDE (pmra)mas/yrpos.pm;pos.eq.radoublenullablee_pmRA*? Error of pmra from Gaia DR2 (pmra_error)mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Gaia DR2 proper motion in declination (pmdec)mas/yrpos.pm;pos.eq.decdoublenullablee_pmDE? Error of pmdec from Gaia DR2 (pmdec_error)mas/yrstat.error;pos.pm;pos.eq.decfloatnullablee_FGGaia DR2 Error of G band in flux (phot_g_mean_flux_error)stat.error;phot.flux;stat.meandoublee_FBPGaia DR2 Error of G_BP band in flux (phot_bp_mean_flux_error)stat.error;phot.flux;stat.meandoublee_FRPGaia DR2 Error of G_RP band in flux (phot_rp_mean_flux_error)stat.error;phot.flux;stat.meandoubleE(BR/RP)Gaia DR2 colour excess factor quality flag (phot_bp_rp_excess_factor)phot.color.excessfloatRV? Gaia DR2 spectroscopic radial velocity (radial_velocity)km/sphys.veloc;pos.heliocentricfloatnullablee_RV? Error of RV from Gaia DR2 (radial_velocity_error)km/sstat.errorfloatnullable_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexed