J/A+A/456/905ivo://CDS.VizieR/J/A+A/456/905doi:10.26093/cds/vizier.34560905CDSDemers S.Battinelli P.Artigau E.2017-06-30T05:47:56Z2006-12-16T23:34:45ZCDS support team

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

cds-question@unistra.frcarbon-starsgalaxiesphotometryccd-photometryFrom a 2{deg}x2{deg} survey of NGC 6822 we have previously established that this Local Group dwarf irregular galaxy possesses a huge spheroid having more than one degree in length. This spheroid is in rotation but its rotation curve is known only within ~15' from the center. It is therefore critical to identify bright stars belonging to the spheroid to characterize, as far as possible, its outer kinematics. We use the new wide field near infrared imager CPAPIR, operated by the SMARTS consortium, to acquire J, K_s_ images of two 34.8'x34.8' areas in the outer spheroid to search for C stars. The colour diagram of the fields allows the identification of 192 C stars candidates but a study of the FWHM of the images permits the rejection of numerous non-stellar objects with colours similar to C stars. We are left with 75 new C stars, their mean K_s_ magnitude and mean colour are similar to the bulk of known NGC 6822 C stars. This outer spheroid survey confirms that the intermediate-age AGB stars are a major contributor to the stellar populations of the spheroid. The discovery of some 50 C stars well beyond the limit of the previously known rotation curve calls for a promising spectroscopic follow-up to a major axis distance of 40'.2006A&A...456..905Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/456/905CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/832 : C star population in NGC 6822 (Letarte+, 2002)J/A+AS/122/463 : Carbon stars in Magellanic Clouds (Kunkel+ 1997)J/AJ/119/2780 : C stars in IC 1613 (Albert+, 2000)J/AJ/120/1801 : C stars in Pegasus, DDO 210 and Tucana (Battinelli+, 2000)J/A+A/410/795 : Photometry of NGC 3109 carbon stars (Demers+, 2003)J/AJ/125/1298 : C star population in outer disk of M31 (Battinelli+, 2003)J/AJ/125/3037 : RI photometry of NGC 205 carbon stars (Demers+, 2003)J/A+A/416/111 : C stars in Wolf-Lundmark-Melotte galaxy (Battinelli+, 2004)J/A+A/417/479 : RI photometry of NGC 185 carbon stars (Battinelli+, 2004)J/A+A/418/33 : RI photometry of C stars in NGC 147 (Battinelli+, 2004)J/A+A/424/125 : Carbon stars in IC10 (Demers+, 2004)J/A+A/436/91 : C star population in outer disk of M31 (Demers+, 2005)J/A+A/447/473 : R I CN TiO photometry of DDO190 C stars (Battinelli+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/456/905https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/456/905http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/456/905https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/456/905https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/456/905http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/456/905GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/456/905/Cstars (Positions, JKs and SLOAN photometry of C stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/456/905/Cstars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/456/905/Cstars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/456/905/Cstars?GETtext/xml+votable180.050000true295.6610833-14.84463890.0055555555555555565/7429 6/29713 29715https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/456/905?format=asciiOpticaldefaultJ/A+A/456/905/CstarsPositions, JKs and SLOAN photometry of C starse_i'mag? Error on i'stat.error;phot.mag;em.opt.IfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpType[MC] Spectral type if knownsrc.spTypechar[DBA2006]Sequential numbermeta.recordint[LDB2002]? Number from Letarte et al. (2002, Cat. <J/AJ/123/832>)meta.idintnullableRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainKsmagKs magnitudephot.mag;em.IR.Kfloate_KsmagError on Ksmagstat.error;phot.mag;em.IR.KfloatJ-KsJ-Ks colour indexphot.color;em.IR.J;em.IR.Kfloate_J-KsError on J-Ksstat.errorfloatSharpSharp parameter from DAOPHOTstat.fit.paramfloati'mag? SLOAN i' magnitudephot.mag;em.opt.Ifloatnullabler'-i'? SLOAN r'-i' colour indexphot.color;em.opt.R;em.opt.Ifloatnullablee_r'-i'? Error on (r'-i')stat.errorfloatnullableg'-i'? SLOAN g'-i' colour indexphot.colorfloatnullablee_g'-i'? Error on (g'-i')stat.errorfloatnullable