J/MNRAS/488/3238ivo://CDS.VizieR/J/MNRAS/488/3238doi:10.26093/cds/vizier.74883238CDSAkras S.Guzman-Ramirez L.Goncalves D.R.2024-08-20T20:12:12Z2023-02-03T15:02:34ZCDS support team

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

cds-question@unistra.frplanetary-nebulaeinfrared-photometryastrometryPlanetary nebulae (PNe) are strong H{alpha} line emitters and a lot of new PNe discoveries have been made by the SuperCOSMOS AAO/UKST H{alpha} Survey (SHS) and the Isaac Newton Telescope Photometric H{alpha} Survey (IPHAS). However, their resulting list of candidates turned out to be heavily contaminated from H{alpha}-line mimics like young stellar objects (YSOs) and/or HII regions. The aim of this work is to find new infrared criteria that can better distinguish compact PNe from their mimics using a machine learning approach and the photometric data from the Two-Micron All-Sky Survey and Wide-field Infrared Survey Explorer. Three classification tree models have been developed with the following colour criteria: W_1_-W_4_>=7.87 and J-H<1.10; H-W_2_>=2.24 and J-H<0.50; and K_s_-W_3_>=6.42 and J-H<1.31 providing a list of candidates, characterized by a high probability to be genuine PNe. The contamination of this list of candidates from H{alpha} mimics is low but not negligible. By applying these criteria to the IPHAS list of PN candidates and the entire IPHAS and VPHAS+ DR2 catalogues, we find 141 sources, from which 92 are known PNe, 39 are new very likely compact PNe (without an available classification or uncertain) and 10 are classified as HII regions, Wolf-Rayet stars, AeBe stars, and YSOs. The occurrence of false-positive identifications in this technique is between 10 and 15 per cent.2019MNRAS.488.3238Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/488/3238CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/504/291 : Candidate Planetary Nebulae in IPHAS catalog (Viironen+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/488/3238https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/488/3238http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/488/3238https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/488/3238https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/488/3238http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/488/3238GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/488/3238/tablea1 (List of known and candidates PNe that satisfy our IR criteria obtained from Viironen et al. (2009A&A...504..291V, Cat. J/A+A/504/291))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/3238/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/3238/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/3238/tablea1?GETtext/xml+votable180.050000true1.472708364.08766670.005555555555555556Cone search capability for table J/MNRAS/488/3238/tablea2 (List of known and candidates PNe that satisfy our IR criteria obtained from the IPHAS DR2 catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/3238/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/3238/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/3238/tablea2?GETtext/xml+votable180.050000true40.399708357.62722220.005555555555555556Cone search capability for table J/MNRAS/488/3238/tablea3 (List of known and candidates PNe that satisfy our IR criteria obtained from the VPHAS+ DR2 catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/3238/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/3238/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/3238/tablea3?GETtext/xml+votable180.050000true118.6099167-28.62902780.0055555555555555566/1351 1512 1848 1920 1967 3042 3067 3152 3253 3302 3332 3639 12960 12972 12984-12985 12990 13036 13039 13055 13992 13997 14063 14076 14239 14282 14338-14339 14343-14344 14349 14353 14360-14362 14373 14387 14401-14402 14411 14428-14429 14449-14450 14453 14455 14460 14594 14596 14603-14604 14606 14608 14626 14654-14655 14699 15407 15428 15435 15437 15455 15462 15472 15476 15632 22075 22137 22166 22209 22249 23636 23816 24343 24361 24368 24376 24425 28821 28847 28856 28868 28879 29098 29112 29513 30259 30270 30282-30283 30304 30308 30310 30312 30327 30329 30355 30358 30364 30401 30414 30431 30504-30505 30610 30615 30621 30626 30635 30653 30656 30658 30684 30687 30697 30699 30703-30704 32019 32068-32069 32071 32083 37247 37373 37923 37929 38016 39793 39804 41592 42175 42209 42416https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/488/3238?format=asciiInfrareddefaultJ/MNRAS/488/3238/tablea1List of known and candidates PNe that satisfy our IR criteria obtained from Viironen et al. (2009A&A...504..291V, Cat. J/A+A/504/291)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSClassSimbad class (G1)src.classcharf_SClass[ab] Flag on Sclass (1)meta.codecharMod1[yn] Object classified as PNe by Model 1 (2)meta.codecharMod2[yn] Object classified as PNe by Model 2 (3)meta.codecharMod3[yn] Object classified as PNe by Model 3 (4)meta.codecharZoneZone (1 or 2) defined by Viironen et al. (2009A&A...504..291V, Cat. J/A+A/504/291) (G2)src.classcharJ/MNRAS/488/3238/tablea2List of known and candidates PNe that satisfy our IR criteria obtained from the IPHAS DR2 cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSClassSimbad class (G1)src.classcharf_SClass[a] Flag on Sclass (1)meta.codecharMod1[yn] Object classified as PNe by Model 1 (2)meta.codecharMod2[yn] Object classified as PNe by Model 2 (3)meta.codecharMod3[yn] Object classified as PNe by Model 3 (4)meta.codecharZoneZone (1 or 2) defined by Viironen et al. (2009A&A...504..291V, Cat. J/A+A/504/291) (G2)src.classcharf_ZoneFlag on Zone (5)meta.codecharJ/MNRAS/488/3238/tablea3List of known and candidates PNe that satisfy our IR criteria obtained from the VPHAS+ DR2 cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSClassSimbad class (G1)src.classcharf_SClass[ab] Flag on SClass (1)meta.codecharMod1[yn] Object classified as PNe by Model 1 (2)meta.codecharMod2[yn] Object classified as PNe by Model 2 (3)meta.codecharMod3[yn] Object classified as PNe by Model 3 (4)meta.codecharZoneZone (1 or 2) defined by Viironen et al. (2009A&A...504..291V, Cat. J/A+A/504/291) (G2)src.classchar