J/A+A/474/35ivo://CDS.VizieR/J/A+A/474/35doi:10.26093/cds/vizier.34740035CDSBattinelli P.Demers S.Mannucci F.2018-02-07T09:19:52Z2018-02-07T10:04:55ZCDS support team

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

cds-question@unistra.frgalaxiescarbon-starsinfrared-photometryThe selection of AGB C and M stars from NIR colours has been done in recent years using adjustable criteria that are in needs of standardization if one wants to compare, in a coherent manner, properties of various populations. We intend to assess the NIR colour technique to identify C and M stars. We compare the NIR colours of several C stars previously identified from spectroscopy or narrow band techniques in WLM, IC 10 and NGC 6822. We demonstrate that very few M stars have (J-K)_0_>1.4 but a non negligible number of C stars are bluer than this limit. Thus, counts of M and C stars based on such limit do not produce pure samples. C/M ratios determined from NIR colours must be regarded as underestimates mainly because the M numbers include many warm C stars and also K stars if no blue limit is considered.2007A&A...474...35Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/474/35CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/416/111 : C stars in Wolf-Lundmark-Melotte galaxy (Battinelli+, 2004)J/A+A/424/125 : Carbon stars in IC10 (Demers+, 2004)J/A+A/466/501 : JKs photometry of WLM galaxy carbon stars (Valcheva+, 2007)J/A+A/493/1075 : JKs photometry of IC1613 & NGC3109 C stars (Battinelli+ 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/474/35https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/474/35http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/474/35https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/474/35https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/474/35http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/474/35GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/474/35/table3 (Known C stars in the IC 10 NICS field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/474/35/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/474/35/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/474/35/table3?GETtext/xml+votable180.050000true4.917833359.33788890.005555555555555556Cone search capability for table J/A+A/474/35/table2 (Known C stars in the WLM NICS field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/474/35/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/474/35/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/474/35/table2?GETtext/xml+votable180.050000true0.47525-15.48641670.0055555555555555566/3042 171657.952274030004205e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/474/35?format=asciiInfrareddefaultJ/A+A/474/35/table3Known C stars in the IC 10 NICS fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[DBL2004]Sequential number from Demers et al., 2004, Cat. J/A+A/424/125meta.recordintI0magDereddened I magnitudemagphot.mag;em.opt.Ifloat(R-I)0Dereddened R-I colour indexmagphot.color;em.opt.R;em.opt.IfloatCN-TiOCN-TiO indexmagphot.color;em.opt.I;em.opt.IfloatKsmagKs magnitudemagphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatJ-KsJ-Ks colour indexmagphot.color;em.IR.J;em.IR.Kfloate_J-Ksrms uncertainty on J-Ksmagstat.error;phot.color;em.IR.JfloatH-KsH-Ks colour indexmagphot.color;em.IR.H;em.IR.Kfloate_H-Ksrms uncertainty on H-Ksmagstat.error;phot.color;em.IR.HfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/474/35/table2Known C stars in the WLM NICS fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BD2004a]Sequential number from Battinelli & Demers, 2004, Cat. J/A+A/416/111meta.recordintImagI magnitudemagphot.mag;em.opt.IfloatR-IR-I colour indexmagphot.color;em.opt.R;em.opt.IfloatCN-TiOCN-TiO indexmagphot.color;em.opt.I;em.opt.IfloatKsmagKs magnitudemagphot.mag;em.IR.Kfloate_Ksmagrms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatJ-KsJ-Ks colour indexmagphot.color;em.IR.J;em.IR.Kfloate_J-Ksrms uncertainty on J-Ksmagstat.error;phot.color;em.IR.JfloatH-KsH-Ks colour indexmagphot.color;em.IR.H;em.IR.Kfloate_H-Ksrms uncertainty on H-Ksmagstat.error;phot.color;em.IR.HfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main