J/ApJ/501/153ivo://CDS.VizieR/J/ApJ/501/153doi:10.26093/cds/vizier.15010153CDSMassey P.1999-04-07T15:48:50Z1999-04-07T15:48:37ZCDS support team

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

cds-question@unistra.frsupergiant-starsccd-photometryradial-velocityKnowledge of the red supergiant (RSG) population of nearby galaxies allows us to probe massive star evolution as a function of metallicity; however, contamination by foreground Galactic dwarfs dominates surveys for red stars in Local Group galaxies beyond the Magellanic Clouds. Model atmospheres predict that low-gravity supergiants will have B-V values that are redder by several tenths of a magnitude than foreground dwarfs at a given V-R color, a result that is largely independent of reddening. We conduct a BVR survey of several fields in the Local Group galaxies NGC 6822, M33, and M31 as well as neighboring control fields and identify RSG candidates from CCD photometry. The survey is complete to V=20.5, corresponding to M_V_=-4.5 or an M_bol_ of -6.3 for the reddest stars. Follow-up spectroscopy at the Ca II triplet of 130 stars is used to demonstrate that our photometric criterion for identifying RSGs is highly successful (96% for stars brighter than V=19.5; 82% for V=19.5-20.5). Classification spectra are also obtained for a number of stars in order to calibrate color with spectral type empirically.1998ApJ...501..153Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/501/153CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/501/153https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/501/153http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/501/153https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/501/153https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/501/153http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/501/153GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/501/153/table2 (Survey of red stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/501/153/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/501/153/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/501/153/table2?GETtext/xml+votable180.050000true296.2325833-14.75963890.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/501/153?format=asciiOpticaldefaultJ/ApJ/501/153/table2Survey of red starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.errorfloatV-RV-R colour indexmagphot.color;em.opt.V;em.opt.Rfloate_V-Rrms uncertainty on V-Rmagstat.errorfloatClassPhotometric classification (1)meta.note;photcharD(B-V)Distance from the cutoff curvemagphot.mag.distModfloatCrd?[IC] Isolated or crowded star? (2)meta.codecharClassSSpectroscopyc classification (1)src.spTypecharSTypeSpectral typesrc.spTypecharCrossIDCorss-identification (3)meta.id.crosscharJ/ApJ/501/153/table3Spectroscopy of red starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar name (1)meta.id;meta.maincharprimaryVmagV magnitudemagphot.mag;em.opt.VfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-RV-R colour indexmagphot.color;em.opt.V;em.opt.RfloatClassrsg or fgd from photometrysrc.classcharD(B-V)Distance from the cutoff curvemagphot.mag.distModfloatCrd?[IC] Isolated or crowded star? (2)meta.codecharRV? Radial velocity (4)km/sphys.veloc;pos.heliocentricintnullableu_RVUncertainty flag on RVmeta.code.errorcharLinesCa II triplet feature intensity (3)spect.line.intensitycharRSG?rsg or fgd from spectroscopysrc.classcharAgree?Yes, Nometa.codecharSTypeSpectral typesrc.spTypechar