J/AJ/157/159ivo://CDS.VizieR/J/AJ/157/159doi:10.26093/cds/vizier.51570159CDSArun R.Mathew B.Manoj P.Ujjwal K.Kartha S.S.Viswanath G.,Narang M.Paul K.T.2019-11-13T14:21:44Z2019-08-06T07:17:12ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsbe-starsstellar-distancestellar-agesstellar-massesThe present study makes use of the unprecedented capability of the Gaia mission to obtain the stellar parameters such as distance, age, and mass of HAeBe stars. The accuracy of Gaia DR2 (Cat. I/345) astrometry is demonstrated from the comparison of the Gaia DR2 distances of 131 HAeBe stars with the previously estimated values from the literature. This is one of the initial studies to estimate the age and mass of a confirmed sample of HAeBe stars using both the photometry and distance from the Gaia mission. Mass accretion rates are calculated from H{alpha} line flux measurements of 106 HAeBe stars. Since we used distances and the stellar masses derived from the Gaia DR2 data in the calculation of the mass accretion rate, our estimates are more accurate than previous studies. The mass accretion rate is found to decay exponentially with age, from which we estimated a disk dissipation timescale of 1.9+/-0.1 Myr. The mass accretion rate and stellar mass exhibit a power-law relation of the form M_acc_{prop.to}M_*_^2.8+/-0.2^. From the distinct distribution in the values of the infrared spectral index, n_2-4.6_, we suggest the possibility of difference in the disk structure between Herbig Be and Herbig Ae stars.2019AJ....157..159Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/157/159CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+AS/104/315 : Member of Herbig Ae/Be stellar group (The+ 1994)J/AJ/118/1043 : Herbig Ae/Be stars catalog (Herbst+, 1999)J/AJ/126/2971 : UBVRI photometry of 131 Herbig Ae/Be (Vieira+, 2003)J/ApJ/653/657 : Spectroscopic observations of Herbig Ae/Be starsJ/MNRAS/453/976 : Herbig Ae/Be X-shooter observations (Fairlamb+, 2015)J/other/NewA/44.1 : Infrared photometric study of Herbig Ae/Be starsJ/A+A/620/A128 : Gaia DR2 study of Herbig Ae/Be stars (Vioque+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/157/159https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/157/159http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/157/159https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/157/159https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/157/159http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/157/159GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/157/159/table1 (Stellar parameters for our 131 HAeBe stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/157/159/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/157/159/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/157/159/table1?GETtext/xml+votable180.050000true262.8539756-23.96264280.0055555555555555566/1113 1114 1168 1545 1591 3038 3057 3245 14031 14040 14311 14344 14687 14696 15370 15683 15684 15701 15759 15798 15840 15851 16131 20831 20934 21354 21402 21418 21421 21430 21436 21439 21456 21458 21480 21643 21646 22020 22080 22804 22828 22829 22841 22854 22860 22861 22886 22892 22895 22911 22981 23637 23644 23717 23736 23767 23798 23970 24277 24279 24281 24449 28921 29193 29207 30188 30251 30363 31259 32065 36956 37169 37186 37334 37353 37362 37366 37676 37714 37851 37883 37886 37890 37916 37932 37934 37978 38002 39228 39260 39290 39908 39926 39929 41472 41662 41698 41734 41767 41812 42217 42382 42392 42429 42595 42611 42644 42931 42972 42988 43235 43444 43637 44049 44301 44356 44362 47828https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/157/159?format=asciidefaultJ/AJ/157/159/table1Stellar parameters for our 131 HAeBe starsSimbadNameSimbad column added by the CDSmeta.idcharl_Age[<] Limit flag on Agemeta.code.error;time.agecharAge[0.1/14.1]? Age from this workMyrtime.agefloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identifiermeta.id;meta.maincharDist[96/5905] Distancepcpos.distance;pos.heliocentricintE_Dist[0/2141] Upper uncertainty in Distpcstat.error;stat.maxinte_Dist[0/1256] Lower uncertainty in Distpcstat.error;stat.minintE_Age[0.01/2.91]? Upper uncertainty in AgeMyrstat.error;stat.maxfloatnullablee_Age[0.01/2.41]? Lower uncertainty in AgeMyrstat.error;stat.minfloatnullableAge-V18[0.011/18.5]? Age from Vioque et al. (2018, J/A+A/620/A128)Myrtime.agefloatnullableE_Age-V18[0.006/18]? Upper uncertainty in Age-V18Myrstat.error;stat.maxfloatnullablee_Age-V18[0.001/5]? Lower uncertainty in Age-V18Myrstat.error;stat.minfloatnullablef_Age-V18[*] Flag on Age-V18 (1)meta.codecharl_Mass[>] Limit flag on Massmeta.code.error;phys.masscharMass[1.49/25]? Mass from this worksolMassphys.massfloatnullableE_Mass[0.01/1.35]? Upper uncertainty in MasssolMassstat.error;stat.maxfloatnullablee_Mass[0.01/0.94]? Lower uncertainty in MasssolMassstat.error;stat.minfloatnullableMass-V18[1.21/31.2]? Mass from Vioque et al. (2018, J/A+A/620/A128)solMassphys.massfloatnullableE_Mass-V18[0.061/11]? Upper uncertainty in V18-MasssolMassstat.error;stat.maxfloatnullablee_Mass-V18[0.061/7]? Lower uncertainty in V18-MasssolMassstat.error;stat.minfloatnullablef_Mass-V18[*] Flag on Mass-V18 (1)meta.codechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main