J/AJ/123/832ivo://CDS.VizieR/J/AJ/123/832doi:10.26093/cds/vizier.51230832CDSLetarte B.Demers S.Battinelli P.Kunkel W.E.2026-01-20T12:12:11Z2003-04-25T17:53:02ZCDS support team

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

cds-question@unistra.frUsing the CFH12K camera, we apply the four-band photometric technique to identify 904 carbon stars in an area 28'x42' centered on NGC 6822. A few C stars outside of this area were also discovered with the Las Campanas Swope Telescope. The NGC 6822 survey employs two sets of observations obtained by rather different telescopes and with different procedures: the Swope Telescope on Las Campanas was used in 1999 October to secure images of NGC 6822 in Kron-Cousins R_KC_, CN (810nm), and TiO (770nm) filters. The 2048x2048 SITe No. 1 CCD yields a field of view of 23.7'x23.7'; NGC 6822 was also observed with the CFH12K at the beginning of one night in 2000 September. The camera consists of a 12Kx8K pixel mosaic covering a field of 42'x28', with each pixel corresponding to 0.206". Images were obtained through Mould I and R filters and through the CN and TiO filters. The NGC 6822 C star population has <I>=19.26 leading to an <M_I_>=-4.70, value essentially identical to the mean magnitude obtained for the C stars in IC 1613. Contrary to stars highlighting the optical image of NGC 6822, C stars are seen at large radial distances and trace a huge, slightly elliptical halo, which does not coincide with the huge H I cloud surrounding NGC 6822. The previously unknown stellar component of NGC 6822 has a exponential scale length of 3.0+/-0.1' and can be traced to 5 scale lengths. The C/M ratio of NGC 6822 is evaluated to be 1.0+/-0.2.2002AJ....123..832Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/123/832CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/110/2715 : UBV photometry in NGC 6822, M31 and M33 (Massey+ 1995)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/AJ/121/2020 : CTIO and WFPC2 photometry in NGC 6822 (Bianchi+, 2001)J/AJ/125/1298 : C star population in outer disk of M31 (Battinelli+, 2003)J/A+A/410/795 : Photometry of NGC 3109 carbon stars (Demers+, 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)Table 1: Journal of observationsNGC 6822 west:NGC 6822 east:CFH12K:https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/123/832https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/123/832http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/123/832https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/123/832https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/123/832http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/123/832GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/123/832/table2 (C stars in NGC 6822 (includes also table3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/123/832/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/123/832/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/123/832/table2?GETtext/xml+votable180.050000true295.9421667-14.92269440.0055555555555555566/29715-29716 297182.367228618189496e-19 2.6706780932288093e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/123/832?format=asciidefaultJ/AJ/123/832/table2C stars in NGC 6822 (includes also table3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[LDB2002]The C star identification numbermeta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainImagThe Kron-Cousins I band magnitudemagphot.mag;em.opt.Ifloate_ImagThe error in Imagmagstat.error;phot.magfloatR-IThe Kron-Cousins (R-I) band colormagphot.color;em.opt.R;em.opt.Ifloate_R-IThe error in R-Imagstat.error;phot.color;em.opt.RfloatCN-TiOThe (CN-TiO) band colormagphot.color;em.opt.I;em.opt.Ifloate_CN-TiOThe error in CN-TiOmagstat.errorfloatT3[3]? identifies the 3 stars outside of the CFH12K fieldmeta.codeintnullable