J/A+A/445/69ivo://CDS.VizieR/J/A+A/445/69doi:10.26093/cds/vizier.34450069CDSSohn Y.J.Kang A.Rhee J.Shin M.Chun M.S.Kim H.I.2006-12-08T11:51:28Z2006-12-08T12:51:05ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-photometrycarbon-starsgiant-starsNear-infrared J, H and K' images were used to investigate the stellar contents of the asymptotic giant branch (AGB) population in the nearby dwarf elliptical galaxy NGC 147. The obtained (K,J-K) and (K,H-K) color-magnitude diagrams contain stars of AGB and red giant branch populations, where the former consists of a group of bright blue stars, a dominant population of M giant and a red C star population.We identified 91 AGB C stars in NGC 147 with the mean absolute magnitude and colors of <M_K_>=-7.56, <(J-K)_0_>=1.81 and <(H-K)_0_>=0.74. The estimated number ratio of C stars to M giant stars (C/M) is 0.16+/-0.02. The estimated local C/M ratios of 0.14+/-0.02 for the inner region (r<70") and 0.19+/-0.03 for the outer region (r>70") indicate a weak radial gradient. The mean bolometric magnitude of 91 C stars in NGC 147 is <M_bol_>=-4.32+/-0.49. The bolometric luminosity function of M giant stars in NGC 147 extends up to M_bol_=-5.8 magnitude, and that of only C stars spans -5.6<M_bol_<-3.5. The color histograms of AGB stars in (J-K) and (H-K) show a main peak containing M giant stars, a red tail containing C stars with a weak excess, and a blue excess possibly due to bright blue foreground stars and AGB stars younger than M giants. The comparison of the theoretical isochrone models with the color distribution and the brightness of AGB stars indicates that most of the bright M giants in NGC 147 were formed at log(t_yr_)~8.4 with a range of 8.2~8.6. Ages of the majority of M giant stars in NGC 147 are similar to those of younger M giant stars in its companion NGC 185, while their formation occurred more recently than the older M giant stars in NGC 185 by ~2Gyrs.2006A&A...445...69Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/445/69CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/403/93 : Photometry of AGB stars in NGC 185 and NGC 147 (Nowotny+, 2003)J/A+A/418/33 : RI photometry of C stars in NGC 147 (Battinelli+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/445/69https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/445/69http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/445/69https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/445/69https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/445/69http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/445/69GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/445/69/table2 (Coordinates and near-IR photometric properties for 91 C stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/445/69/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/445/69/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/445/69/table2?GETtext/xml+votable180.050000true8.277083348.52036110.0055555555555555566/2764 2777https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/445/69?format=asciiInfrareddefaultJ/A+A/445/69/table2Coordinates and near-IR photometric properties for 91 C starsSeqID number of C starmeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainK'magK' band (2.12um) magnitude of C starmagphot.mag;em.IR.Kfloate_K'magError of K magnitudemagstat.error;phot.mag;em.IR.Kfloat(J-K')(J-K') color indexmagphot.color;em.IR.J;em.IR.Kfloate_(J-K')Error of (J-K') color indexmagstat.errorfloat(H-K')(H-K') color indexmagphot.color;em.IR.H;em.IR.Kfloate_(H-K')Error of (H-K') color indexmagstat.errorfloat(V-i)0? (V-i) color index by Nowotny et al., 2003, Cat. <J/A+A/403/93>magphot.color;em.opt.V;em.opt.IfloatnullableNowotny? ID number of Nowotny et al., 2003, Cat. <J/A+A/403/93>, recno number in Vizirmeta.idintnullableR-I? (R-I) color index by Battinelli & Demers, 2004, Cat. <J/A+A/418/33>magphot.color;em.opt.R;em.opt.Ifloatnullable[BD2004c]? ID number of Battinelli & Demers, 2004, Cat. <J/A+A/418/33>meta.idintnullable