J/AJ/115/734ivo://CDS.VizieR/J/AJ/115/734doi:10.26093/cds/vizier.51150734CDSSung H.Bessell M.S.Lee S.-W.2023-04-06T16:50:29Z2007-02-15T21:37:07ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomybroad-band-photometryh-alpha-photometryUBVRI and H{alpha} CCD photometry has been obtained for the young open cluster NGC 6231. From the R-H{alpha} color, a measure of the H{alpha} emission, we find 12 pre-main-sequence (PMS) members and seven possible PMS members in the cluster. Applying recent stellar evolutionary tracks and PMS evolutionary tracks, we derive the age, age spread, and initial mass function of the cluster. The initial mass function of NGC 6231 is a Gaussian with a turnover at logm~0.4 (m~2.5M_{Sun}_) and shows an abrupt decrease in the number of low-mass stars. Possible reasons for the suppression of low-mass star formation and star formation processes are discussed.1998AJ....115..734Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/115/734CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/325/167 : Geneva photometry in NGC 6231 (Raboud+ 1997)Table 1A: Atmospheric coefficientsTable 1B: Zero pointsTable 3: Comparison with photoelectric photometryhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/115/734https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/115/734http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/115/734https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/115/734https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/115/734http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/115/734GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/115/734/table2 (Photometric data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/115/734/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/115/734/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/115/734/table2?GETtext/xml+votable180.050000true253.3097803-41.8598650.005555555555555556Cone search capability for table J/AJ/115/734/table4 (PMS (pre-main-sequence) stars and PMS candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/115/734/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/115/734/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/115/734/table4?GETtext/xml+votable180.050000true253.4198328-41.8034750.0055555555555555566/42383 42394https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/115/734?format=asciiOpticalInfrareddefaultJ/AJ/115/734/table2Photometric datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number (Cl* NGC 6231 SBL NNN in Simbad)meta.id;meta.mainintprimaryoRAOffset in right ascension (1)arcminpos.eq.ra;arith.difffloatoDEOffset in declination (1)arcminpos.eq.dec;arith.difffloato_VmagNumber of independent observations for Vmagmeta.numberintVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloato_V-I? Number of independent observations for V-Imeta.numberintnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-I? rms uncertainty on V-Imagstat.error;phot.color;em.opt.Vfloatnullableo_B-V? Number of independent observations for B-Vmeta.numberintnullableB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-Vmagstat.error;phot.color;em.opt.Bfloatnullableo_U-B? Number of independent observations for U-Bmeta.numberintnullableU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? rms uncertainty on U-Bmagstat.error;phot.color;em.opt.Ufloatnullableo_R-Ha? Number of independent observations for R-Hameta.numberintnullableR-Ha? R-H{alpha} colour indexmagphot.color;em.opt.R;em.line.Halphafloatnullablee_R-Ha? rms uncertainty on R-Hamagstat.errorfloatnullableSpTypeMK Spectral typesrc.spTypecharNameOther name (2)meta.idchar_RAPosition computed from a comparison with UCAC2 catalog I/289 ({sigma}=0.3'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC2 catalog I/289 ({sigma}=0.3'') (declination part)degpos.eq.dec;meta.mainJ/AJ/115/734/table4PMS (pre-main-sequence) stars and PMS candidatesPMS[SC] S: PMS star, C: PMS candidatemeta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number (2)meta.id;meta.mainintprimaryn_ID[a] a: PMS star 667 = Se 166meta.notecharoRAOffset in right ascension (1)arcminpos.eq.ra;arith.difffloatoDEOffset in declination (1)arcminpos.eq.dec;arith.difffloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatV-IV-I colour indexmagphot.color;em.opt.V;em.opt.Ifloate_V-Irms uncertainty on V-Imagstat.error;phot.color;em.opt.VfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatU-BU-B colour indexmagphot.color;em.opt.U;em.opt.Bfloate_U-Brms uncertainty on U-Bmagstat.error;phot.color;em.opt.UfloatR-HaR-H{alpha} colour indexmagphot.color;em.opt.R;em.line.Halphafloate_R-Harms uncertainty on R-Hamagstat.errorfloat_RAPosition computed from a comparison with UCAC2 catalog I/289 ({sigma}=0.3'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC2 catalog I/289 ({sigma}=0.3'') (declination part)degpos.eq.dec;meta.mainJ/AJ/115/734/table5Mass function of NGC 6231recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlog(M)lLower value of log(m) intervallog(solMass)phys.massfloatlog(M)uUpper value of log(m) intervallog(solMass)phys.massfloatNtotTotal number of starsmeta.numberintNPMS? Number of PMS includedmeta.id;meta.mainintnullablelog(IMF)log of Initial Mass Function (1)log(solMass.kpc**-2)phys.densityfloat