J/AJ/96/1884ivo://CDS.VizieR/J/AJ/96/1884doi:10.26093/cds/vizier.50961884CDSHumphreys R.M.Pennington R.L.Jones T.J.Ghigo F.D.2013-03-04T06:55:39Z1997-12-09T20:42:23ZCDS support team

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

cds-question@unistra.frsupergiant-starsinfrared-photometryWe have surveyed M31 for its most luminous red stars; 300 candidates were found distributed across the face of the galaxy. JHK infrared photometry was observed for 57 of the candidates, and far-red (6800-8800A) spectra were also obtained for 45 stars. We have used the strength of the Ca II triplet (~8500A) and the J-H and H-K colors as luminosity discriminants to separate the supergiants from the foreground dwarfs. With these criteria, 23 probable late-type supergiants were identified. We discuss their distribution and relative numbers of the red supergiants in comparison with the known WR stars in M31. Accurate extinction and infrared (K=2.2{mu}m) and bolometric luminosities are also derived from the infrared photometry. We find that although visually bright red supergiants (M_V_=-8mag) exist in M31, the most luminous (M_bol_) red supergiants are not found in the relative numbers we would expect in a galaxy of its size and mass. It is probable that the rate of massive-star formation is less in M31, an Sb type spiral, than has been observed in the Sc spirals and irregulars.1988AJ.....96.1884Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/96/1884CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/144 : Brightest stars in the field of M31 (Berkhuijsen+ 1988)II/145 : Brightest stars in a foreground field of M31 (Berkhuijsen+, 1988)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/96/1884https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/96/1884http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/96/1884https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/96/1884https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/96/1884http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/96/1884GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/96/1884/table1 (Red stars in M31: positions, magnitudes,and colors)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/96/1884/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/96/1884/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/96/1884/table1?GETtext/xml+votable180.050000true11.68097342.2515270.0055555555555555566/2622 2623 2666 2705 2708 2709 27527.952274030004205e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/96/1884?format=asciiInfrareddefaultJ/AJ/96/1884/table1Red stars in M31: positions, magnitudes,and colorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar designation (1)meta.id;meta.maincharRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainVmag? V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatnullableB-V? B-V color indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatnullableV-R? V-R color indexmagphot.color;em.opt.V;em.opt.Rfloatnullablee_V-R? rms uncertainty on V-Rmagstat.error;phot.color;em.opt.VfloatnullableYear? Year minus 1900yrtimeintnullablen_Year[a] a: averagemeta.notecharJ-H? J-H color indexmagphot.color;em.IR.J;em.IR.Hfloatnullableu_J-HUncertainty flag on J-Hmeta.code.error;phot.color;em.IR.Jchare_J-H? rms uncertainty on J-Hmagstat.error;phot.color;em.IR.JfloatnullableH-K? H-K color indexmagphot.color;em.IR.H;em.IR.Kfloatnullableu_H-KUncertainty flag on H-Kmeta.code.error;phot.color;em.IR.Hchare_H-K? rms uncertainty on H-Kmagstat.error;phot.color;em.IR.HfloatnullableKmag? K magnitudemagphot.mag;em.IR.Kfloatnullableu_KmagUncertainty flag on Kmagmeta.code.errorchare_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.KfloatnullableAssoc? Association number (2)meta.idintnullableRemRemarksmeta.notecharCat.Catalogue number (3)meta.idchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed