J/AJ/112/2559ivo://CDS.VizieR/J/AJ/112/2559doi:10.26093/cds/vizier.51122559CDSSohn Y.-J.Davidge T.J.2023-04-06T16:50:22Z1997-12-09T20:38:03ZCDS support team

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

cds-question@unistra.frsupergiant-starsinfrared-photometryvisible-astronomyphotometryV, R, and I CCD images are used to investigate the photometric properties and spatial distribution of supergiants in the nearby interacting galaxy NGC 672. Not counting stars imbedded in H II regions, our sample consists of 237 objects. The (V-R,V-I) two-color diagram indicates that the majority of these stars have spectral types between A-K. Statistical tests show that the outer region of NGC 672 contains a redder population of supergiants than the inner region. Comparisons with theoretical evolutionary tracks indicate that the majority of the supergiants in NGC 672 have progenitor masses between 15M_{sun}_ and 25M_{sun}_, and that the inner regions contain stars that are more massive than in the outer disk, indicating that an age gradient is present. The luminosity functions in all three bandpasses follow power laws, and the exponent in V=0.79+/-0.06, in good agreement with other galaxies. The brightest red supergiants occur at V~22.0, from which we derive a distance modulus of 29.5, corresponding to 7.9(+1.0)(-0.9)Mpc.1996AJ....112.2559Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/112/2559CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/112/2559https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/112/2559http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/112/2559https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/112/2559https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/112/2559http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/112/2559GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/112/2559/table2Positions, magnitudes, and colors of NGC 672 starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification numbermeta.id;meta.mainintXcX pixel locationpixpos.cartesian.x;instr.detdoubleYcY pixel locationpixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatV-IV-I color indexmagphot.color;em.opt.V;em.opt.Ifloate_V-Irms uncertainty on V-Imagstat.errorfloatR-IR-I color indexmagphot.color;em.opt.R;em.opt.Ifloate_R-Irms uncertainty on R-Imagstat.errorfloatHIIH II region number from Hodge, 1969ApJ...155..417Hmeta.idchar