J/A+A/578/A51ivo://CDS.VizieR/J/A+A/578/A51doi:10.26093/cds/vizier.35780051CDSChun S.-H.Kang M.Kim J.-W.Sohn Y.-J.2015-10-01T12:18:01Z2015-06-03T08:50:37ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryinfrared-sourcesgiant-starscarbon-starsWe investigated the photometric properties of asymptotic giant branch (AGB) stars of dwarf irregular galaxy IC 1613 and its metallicity. We used near-infrared JHKs photometric data obtained with the WIRCam array on Canada-France-Hawaii Telescope (CHFT). The optical gi imaging data of previous study were cross-matched with ours to distinguish the stellar populations in the galaxy and to select the AGB stars. We also separated the C stars from the M-giant stars in the JHKs color-color diagram. We identified 140 C stars and 306 M-giant stars in IC 1613. The (J-Ks) color histogram of AGB stars shows the main peak of M-giant stars and the red tail of C stars. The broad color distribution of M-giant stars and the isochrones in color magnitude diagram indicate that IC 1613 has a wide range of intermediate-age stars. We also know that most C stars were formed over the past 2-8Gyr according the M_bol-age relation. The C/M ratio of 0.46+/-0.05 was estimated and [Fe/H] abundance of -1.23+/-0.06 was derived from the C/M ratio. Radial distributions of C/M ratio and metallicity show the shallow trend of the negative metallicity gradient from the center. The local C/M ratio also indicates that the HI cavity has higher C/M values than the bright HI spot and HI gas region. However, the low [Fe/H] value near the central region of the galaxy is likely to be caused by the change in age of the dominant stellar population according to the radial distance, not the real metallicity variation. It might also be that relatively younger and metal-rich C stars are concentrated in the center of the galaxy, while the M-giant stars were homogeneously distributed from the center to the borders of the galaxy.2015A&A...578A..51Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/578/A51CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/363/29 : Variable stars in IC 1613 (Antonello+, 2000)J/AJ/119/2780 : C stars in IC 1613 (Albert+, 2000)J/AcA/51/221 : OGLE-II. Cepheids in IC 1613 (Udalski+, 2001)J/A+A/367/759 : Variable stars in IC 1613 (Mantegazza+, 2001)J/A+A/445/901 : BV(RI)c bands of Cepheids in IC 1613 (Antonello+, 2006)J/A+A/493/1075 : IC 1613 & NGC 3109 C stars JKs photometry (Battinelli+ 2009)J/A+A/502/1015 : OB associations in IC 1613 (Garcia+, 2009)J/A+A/523/A23 : Properties of OB associations in IC 1613 (Garcia+, 2010)J/A+A/573/A84 : JHK photometry of IC 1613 AGB (Sibbons+, 2015)J/ApJ/712/1259 : LCID project. II. Variables in IC1613 (Bernard+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/578/A51https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/578/A51http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/578/A51https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/578/A51https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/578/A51http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/578/A51GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/578/A51/table2 (Sky position and photometric measurement for 446 AGB stars in IC 1613)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/578/A51/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/578/A51/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/578/A51/table2?GETtext/xml+votable180.050000true16.395712.221720.0055555555555555566/180417.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/578/A51?format=asciiOpticalInfrareddefaultJ/A+A/578/A51/table2Sky position and photometric measurement for 446 AGB stars in IC 1613e_Jmag[0.02/0.1] Error of J magnitudemagstat.error;phot.mag;em.IR.Jfloate_Ksmag[0.01/0.1] Error of Ks magnitudemagstat.error;phot.mag;em.IR.KfloatclClassification of C-star and M-giantmeta.code.class;src.classcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[475/22374] ID number of identified AGB starsmeta.id;meta.mainintRAJ2000Right Ascension J2000 (degrees)degpos.eq.ra;meta.mainDEJ2000Declination J2000 (degrees)degpos.eq.dec;meta.mainJmag[17.1/20.2] J band magnitudemagphot.mag;em.IR.JfloatHmag[16.1/19.2] H band magnitudemagphot.mag;em.IR.Hfloate_Hmag[0.02/0.1] Error of H magnitudemagstat.error;phot.mag;em.IR.HfloatKsmag[15.5/18.2] Ks band magnitudemagphot.mag;em.IR.Kfloat