J/MNRAS/483/5077ivo://CDS.VizieR/J/MNRAS/483/5077doi:10.26093/cds/vizier.74835077CDSAkras S.Leal-Ferreira M.L.Guzman-Ramirez L.Ramos-Larios G.2024-08-19T20:16:10Z2022-08-18T12:42:01ZCDS support team

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

cds-question@unistra.frmultiple-starsphotometryclassificationvisible-astronomyh-alpha-photometryIn this second paper in a series of papers based on the most-up-to-date catalogue of symbiotic stars (SySts), we present a new approach for identifying and distinguishing SySts from other H{alpha} emitters in photometric surveys using machine learning algorithms such as classification tree, linear discriminant analysis, and K-nearest neighbour. The motivation behind this work is to seek for possible colour indices in the regime of near- and mid-infrared covered by the 2MASS and WISE surveys. A number of diagnostic colour-colour diagrams are generated for all the known Galactic SySts and several classes of stellar objects that mimic SySts such as planetary nebulae, post-AGB, Mira, single K and M giants, cataclysmic variables, Be, AeBe, YSO, weak and classical T Tauri stars, and Wolf-Rayet. The classification tree algorithm unveils that primarily J-H, W1-W4, and K_s_-W3, and secondarily, H-W2, W1-W2, and W3-W4 are ideal colour indices to identify SySts. Linear discriminant analysis method is also applied to determine the linear combination of 2MASS and AllWISE magnitudes that better distinguish SySts. The probability of a source being an SySt is determined using the K-nearest neighbour method on the LDA components. By applying our classification tree model to the list of candidate SySts (Paper I, Akras et al. 2019MNRAS.483.5077A), the IPHAS list of candidate SySts, and the DR2 VPHAS+ catalogue, we find 125 (72 new candidates) sources that pass our criteria while we also recover 90 per cent of the known Galactic SySts.2019MNRAS.483.5077Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/483/5077CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)II/311 : WISE All-Sky Data Release (Cutri+ 2012)II/341 : VPHAS+ DR2 survey (Drew+, 2016)J/A+A/480/409 : IPHAS symbiotic stars candidates (Corradi+, 2008)J/MNRAS/440/2036 : VPHAS+ survey synthetic colours (Drew+, 2014)J/ApJS/240/21 : Symbiotic stars with 2MASS, WISE + Gaia data (Akras+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/483/5077https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/483/5077http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/483/5077https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/483/5077https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/483/5077http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/483/5077GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/483/5077/tablec1 (A further classification of the candidates based on the classification tree)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/483/5077/tablec1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/483/5077/tablec1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/483/5077/tablec1?GETtext/xml+votable180.050000true171.3864583-59.94280560.0055555555555555566/4763 12984 14364 14426 14614 14643-14644 14692 15394 15624 15685 28718 28781 28804 28819-28820 28822-28823 28833 28836-28837 28839 28842-28844 28850 28853-28854 28856 28861 28866 28873 28882 28886 28889 28892 28898 28904 28910 28920 28927 29090 29107 29162-29163 29460 29508 29527 29529 29882 30215 30245 30271 30285 30325-30326 30357 30360 30367 30413 30448 30451-30452 30598 30626 30664 30680 30708 37365 37914 41584 41656 41675 41700 41799 41802 42158 42206 42216 42228 42382 42389 42417 42435 42447 43016 43129 43922 44083https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/483/5077?format=asciiOpticaldefaultJ/MNRAS/483/5077/tablec1A further classification of the candidates based on the classification treeSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClassSymbiotic star classification (G1)src.class.starGalaxycharNameCandidate SySt namemeta.id;meta.maincharSPBSySts/PNe/Be classification (G2)src.classcharSCMSySts/CV/Mira classification (G3)src.classcharSCYSySts/CV/YSO classification (G4)src.classcharSWpASySts/WR/post-AGB classification (G5)src.classcharSKMSySts/K-giants/M-giants classification (G6)src.classcharSWCSySts/WTT/ClTT classification (G7)src.classcharSBASySts/Be/AeBe classification (G8)src.classcharONameOther name found in literature for the SySt candidatemeta.idcharTypeComments on the SySt candidate (G9)meta.notecharr_TypeReferences for Type (G10)meta.notechar_RAPositons from Simbad and names (right ascension part)degpos.eq.ra;meta.main_DEPositons from Simbad and names (declination part)degpos.eq.dec;meta.mainJ/MNRAS/483/5077/tablec2A further classification of the candidates based on the LDA/KNNrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClassSymbiotic star classification (G1)src.class.starGalaxycharNameCandidate SySt namemeta.id;meta.maincharSPBSySts/PNe/Be classification (G2)src.classcharSCMSySts/CV/Mira classification (G3)src.classcharSCYSySts/CV/YSO classification (G4)src.classcharSWpASySts/WR/post-AGB classification (G5)src.classcharSKMSySts/K-giants/M-giants classification (G6)src.classcharSWCSySts/WTT/ClTT classification (G7)src.classcharSBASySts/Be/AeBe classification (G8)src.classcharONameOther name found in literature for the SySt candidatemeta.idcharTypeComments on the SySt candidate (G9)meta.notecharr_TypeReferences for Type (G10)meta.notechar