J/AJ/120/333ivo://CDS.VizieR/J/AJ/120/333doi:10.26093/cds/vizier.51200333CDSSung H.Chun M.-Y.Bessell M.S.2023-04-06T16:50:40Z2000-10-14T16:19:04ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsinfrared-photometryvisible-astronomyWide-band photometryh-alpha-photometryNew UBVRI and H{alpha} photometry has been obtained for the young open cluster NGC 6530 located 10' east of the Lagoon Nebula (M8). We found 37 pre-main-sequence (PMS) stars with H{alpha} emission and nine PMS candidates using the R-H{alpha} color, a measure of H{alpha} emission. From this new photometry we derived the cluster parameters (V_0_-M_V_=11.25+/-0.1mag and E(B-V)=0.35mag), typical age (1.5Myr), and an age spread of about 5Myr. We confirmed the presence of a small amount of differential reddening across the cluster. We also verified the abnormal reddening law for the cluster, especially for a heavily embedded O7 V star, Herschel 36. Comparisons were made for several PMS evolution models with regard to the resulting age distribution and the initial mass function.2000AJ....120..333Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/120/333CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/116/1801 : IC 4996 CCD photometry (Delgado+, 1998)J/A+AS/123/63 : NGC 6530 multiwavelength photometry (van den Ancker+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/120/333https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/120/333http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/120/333https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/120/333https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/120/333http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/120/333GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/120/333/table1 (Photometric data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/120/333/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/120/333/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/120/333/table1?GETtext/xml+votable180.050000true270.8425-24.3408610.005555555555555556Cone search capability for table J/AJ/120/333/table3 (PMS stars with H{alpha} emission)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/120/333/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/120/333/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/120/333/table3?GETtext/xml+votable180.050000true270.857083-24.3491670.005555555555555556Cone search capability for table J/AJ/120/333/table4 (PMS candidates with weak H{alpha} emission)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/120/333/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/120/333/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/120/333/table4?GETtext/xml+votable180.050000true270.897083-24.3738890.005555555555555556Cone search capability for table J/AJ/120/333/table5 (PMS stars and candidates from HST data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/120/333/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/120/333/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/120/333/table5?GETtext/xml+votable180.050000true270.922083-24.3750.0055555555555555566/28890-288913.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/120/333?format=asciiOpticalInfrareddefaultJ/AJ/120/333/table1Photometric datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSCB[1/887]+ Running identification number in NGC 6530 (Cl* NGC 6530 SCB NNNN in Simbad)meta.id;meta.mainintprimaryindexedRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainTab[3-4]? Table number if object in tables 3 or 4meta.idintnullableVmagThe weighted mean V band magnitudemagphot.mag;em.opt.VfloatV-IThe weighted mean V-I colormagphot.color;em.opt.V;em.opt.IfloatB-VThe weighted mean B-V colormagphot.color;em.opt.B;em.opt.VfloatU-BThe weighted mean U-B colormagphot.color;em.opt.U;em.opt.BfloatR-Ha? The weighted mean (R-H{alpha} filter) colormagphot.color;em.opt.R;em.line.Halphafloatnullablee_V-IUncertainty in V-Imagstat.error;phot.color;em.opt.VfloatRemarkFurther remarks (2)meta.notechare_VmagUncertainty in Vmagmagstat.error;phot.mag;em.opt.Vfloate_B-VUncertainty in B-Vmagstat.error;phot.color;em.opt.Bfloate_U-BUncertainty in U-Bmagstat.error;phot.color;em.opt.Ufloate_R-Ha? Uncertainty in R-Hamagstat.error;phot.color;em.opt.Rfloatnullableo_VmagNumber of observations for Vmagmeta.numberinto_V-INumber of observations for V-Imeta.numberinto_B-VNumber of observations for B-Vmeta.numberinto_U-BNumber of observations for U-Bmeta.numberinto_R-HaNumber of observations for R-Hameta.numberintWalker? The Walker (1957ApJ...125..636W) identification number (NGC 6530 NNN in Simbad)meta.id.crossintnullablef_WalkerDuplicity or uncertainty (?) flag for Walkermeta.codecharProb[0,1]? Proper motion membership probability (1)pos.pm;stat.probabilityfloatnullableSpType? Spectral type and luminosity class (2)src.spTypecharJ/AJ/120/333/table3PMS stars with H{alpha} emissionSCBSequential numbermeta.recordintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatV-IV-I colour indexmagphot.color;em.opt.V;em.opt.IfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableR-HaR-H{alpha} colour indexmagphot.color;em.opt.R;em.line.Halphafloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloate_V-Irms uncertainty on V-Imagstat.error;phot.color;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.error;phot.color;em.opt.Bfloate_U-B? rms uncertainty on U-Bmagstat.error;phot.color;em.opt.Ufloatnullablee_R-Harms uncertainty on R-Hamagstat.error;phot.color;em.opt.RfloatRemRemarksmeta.notecharo_VmagNumber of observation for Vmagmeta.numberinto_V-INumber of observation for V-Imeta.numberinto_B-VNumber of observation for B-Vmeta.numberinto_U-B? Number of observation for U-Bmeta.numberintnullableo_R-HaNumber of observation for R-Hameta.numberintJ/AJ/120/333/table4PMS candidates with weak H{alpha} emissionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSCBSequential numbermeta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatV-IV-I colour indexmagphot.color;em.opt.V;em.opt.IfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableR-HaR-H{alpha} colour indexmagphot.color;em.opt.R;em.line.Halphafloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloate_V-Irms uncertainty on V-Imagstat.error;phot.color;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.error;phot.color;em.opt.Bfloate_U-B? rms uncertainty on U-Bmagstat.error;phot.color;em.opt.Ufloatnullablee_R-Harms uncertainty on R-Hamagstat.error;phot.color;em.opt.Rfloato_VmagNumber of observation for Vmagmeta.numberinto_V-INumber of observation for V-Imeta.numberinto_B-VNumber of observation for B-Vmeta.numberinto_U-B? Number of observation for U-Bmeta.numberintnullableo_R-HaNumber of observation for R-Hameta.numberintRemRemarksmeta.notecharJ/AJ/120/333/table5PMS stars and candidates from HST datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPMS[SC] S: PMS stars, C: PMS candidatesmeta.code.classcharSCBSequential numbermeta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatV-IV-I colour indexmagphot.color;em.opt.V;em.opt.IfloatHaH{alpha} magnitudemagphot.flux;em.line.Halphafloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.Vfloate_V-Irms uncertainty on V-Imagstat.error;phot.color;em.opt.Vfloate_Harms uncertainty on Hamagstat.errorfloato_VmagNumber of observation for Vmeta.numberinto_V-I? Number of observation for V-Imeta.numberintnullableo_HaNumber of observation for H{alpha}meta.numberint