J/A+A/543/A35ivo://CDS.VizieR/J/A+A/543/A35doi:10.26093/cds/vizier.35430035CDSJung M.Y.Ko J.Kim J.-W.Chun S.-H.Kim H.-I.Sohn Y.-J.2012-10-14T14:21:46Z2012-07-25T11:24:49ZCDS support team

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

cds-question@unistra.frgalaxiesgiant-starscarbon-starsinfrared-photometryWe investigated the distribution of resolved asymptotic giant branch (AGB) stars over a much larger area than covered by previous near-infrared studies in the nearby dwarf elliptical galaxy NGC 205. Using data obtained with the WIRCam near-infrared imager of the CFHT, we selected the AGB stars in the JHKs color - magnitude diagrams, and separated the C stars from M-giant stars in the JHKs color - color diagram. We identified 1,550 C stars in NGC 205 with a mean absolute magnitude of <M_Ks>=-7.49+/-0.54, and colors of <(J-K)_0>=1.81+/-0.41 and <(H-Ks)_0>=0.76+/-0.24. The ratio of C stars to M-giant stars was estimated to be 0.15+/-0.01 in NGC 205, and the local C/M ratios for the southern region are somewhat lower than those for the northern region. The (J-K) color distributions of AGB stars contain the main peak of the M-giant stars and the red tail of the C stars. A comparison of the theoretical isochrone models with the observed color distribution indicates that most of the bright M-giant stars in NGC 205 were formed at log(t_yr_)~9.0-9.7. The logarithmic slope of the M_Ks_ luminosity function for M-giant stars was estimated to be 0.84+/-0.01, which is comparable with dwarf elliptical galaxies NGC 147 and NGC 185. Furthermore, we found that the logarithmic slopes of the M_Ks_ luminosity function for C and M-giant stars are different to places, implying a different star formation history within NGC 205. The bolometric luminosity function for M-giant stars extends to M_bol_=-6.0mag, and that for C stars spans -5.6<M_bol_<-3.0. The bolometric luminosity function of C stars is unlikely to be a Gaussian distribution and the mean bolometric magnitude of C stars is estimated to be M_bol_=-4.24+/-0.55, which is consistent with our results for dwarf elliptical galaxies NGC 147 and NGC 185.2012A&A...543A..35Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/543/A35CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/125/3037 : RI photometry of NGC 205 carbon stars (Demers+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/543/A35https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/543/A35http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/543/A35https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/543/A35https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/543/A35http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/543/A35GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/543/A35/table1 (Coordinates and photometric properties for 1550 C stars in NGC 205)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/543/A35/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/543/A35/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/543/A35/table1?GETtext/xml+votable180.050000true10.342791741.52908330.0055555555555555565/677 6/7.952274030004205e-20 2.6706780932288093e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/543/A35?format=asciiInfrareddefaultJ/A+A/543/A35/table1Coordinates and photometric properties for 1550 C stars in NGC 205H-KsH-Ks color indexmagphot.color;em.IR.H;em.IR.KfloatJ-KsJ-Ks color indexmagphot.color;em.IR.J;em.IR.KfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDID number of C starmeta.id;meta.mainintRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainKsmagKs band magnitude of C starmagphot.mag;em.IR.Kfloate_KsmagError of Ks magnitudemagstat.error;phot.mag;em.IR.Kfloate_J-KsError of J-Ks color indexmagstat.error;phot.color;em.IR.Jfloate_H-KsError of H-Ks color indexmagstat.error;phot.color;em.IR.HfloatImag? I band magnitude of C star (1)magphot.mag;em.opt.Ifloatnullablee_Imag? Error of I magnitude (1)magstat.error;phot.mag;em.opt.IfloatnullableR-I? R-I color index (1)magphot.color;em.opt.R;em.opt.Ifloatnullablee_R-I? Error of R-I color index (1)magstat.error;phot.color;em.opt.RfloatnullableCN-TiO? CN-TiO color index (1)magphot.color;em.opt.I;em.opt.Ifloatnullablee_CN-TiO? Error of CN-TiO color index (1)magstat.errorfloatnullable[DBL2003]? ID number of Demers et al., 2003, Cat. J/AJ/125/3037meta.idintnullable