J/A+AS/123/63ivo://CDS.VizieR/J/A+AS/123/63CDSvan den Ancker M.E.The P.S.Feinstein A.Vazquez R.A.de Winter D.,Perez M.R.2013-03-06T06:35:14Z1998-09-05T09:22:38ZCDS support team

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

cds-question@unistra.fropen-star-clustersphotometryThe distance and formation history of the very young open cluster NGC 6530 were investigated by studying a total of 132 probable member stars of this open cluster. It was concluded that the distance to NGC 6530 is 1.8+/-0.2kpc, and its interstellar reddening E(B-V) is 0.30. Furthermore, we conclude that the extinction law of the intracluster material is normal (i.e. R_V=3.1), but anomalous extinction laws were found for several more embedded stars in the cluster. Of the 132 stars included in this study, 11 are suspected to be variable, five show Halpha in emission and nine show an infrared excess. Among the member stars of NGC 6530, three were found to be part of the Herbig Ae/Be stellar class, whereas two others are possible members of this stellar group as well. Also, one cluster member is probably a new massive post-AGB star, whereas the same could possibly apply to another member star. Finally, from the distribution of post- and pre-main sequence stars in the cluster's HR-diagram, it was concluded that the process of star formation in NGC 6530 must have started a few times 10^7 years ago and, for the less massive stars, is probably still going on today.1997A&AS..123...63Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/123/63CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/123/63https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/123/63http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/123/63https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/123/63https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/123/63http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/123/63GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/123/63/table1 (Properties of programme stars in NGC 6530 from literature)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/123/63/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/123/63/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/123/63/table1?GETtext/xml+votable180.050000true270.589269-24.2501090.0055555555555555566/28889-288917.952274030004205e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/123/63?format=asciiOpticaldefaultJ/A+AS/123/63/table1Properties of programme stars in NGC 6530 from literaturerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVAJStar number by van Altena & Jones (1972A&A....20..425V)meta.idcharWalkStar number by Walker (1957ApJ...125..636W) and Kilambi (1977MNRAS.178..423K)meta.idcharSagStar number by Sagar & Joshi (1978MNRAS.184..467S)meta.idcharOtherOther designationmeta.id;meta.maincharRAJ1950Right ascension (J1950)pos.eq.ra;meta.mainDEJ1950Declination (J1950)pos.eq.dec;meta.mainProb? Proper motion membership probability%statintnullableVmagV magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableHRV? Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullableSpSpectral typesrc.spTypecharRef.Reference for spectral type (1)meta.ref;pos.framechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/A+AS/123/63/table2New photometric data of stars in NGC 6530recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNo.Star number for new starsmeta.id;meta.maincharprimaryVmag? Walraven V intensityphot.mag;em.opt.VfloatnullableVmag1? Johnson V magnitude computed from Walraven V and V-Bmagphot.mag;em.opt.VfloatnullableV-B? Walraven V-B colour indexphot.color;em.opt.V;em.opt.BfloatnullableB-U? Walraven B-U colour indexphot.color;em.opt.B;em.opt.UfloatnullableU-W? Walraven U-W colour indexphot.color;em.opt.U;em.opt.UfloatnullableB-L? Walraven D-L colour indexphot.color;em.opt.B;em.opt.UfloatnullableDate1Date (dd/mm/yy) of Walraven measurementtime.epochcharVmag2? Johnson V magnitudemagphot.mag;em.opt.VfloatnullableB-V? Johnson B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableU-B? Johnson U-B colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableV-R? Cousins V-R colour indexmagphot.color;em.opt.V;em.opt.RfloatnullableV-I? Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableDate2Date (dd/mm/yy) of UBVRI measurementtime.epochcharJmag? ESO J magnitude indexmagphot.mag;em.IR.JfloatnullableHmag? ESO H magnitude indexmagphot.mag;em.IR.HfloatnullableKmag? ESO K magnitude indexmagphot.mag;em.IR.KfloatnullableDate3Date (dd/mm/yy) of JHK measurementtime.epochcharRemark[1/2] Remarks (1)meta.notecharJ/A+AS/123/63/table5Astrophysical parameters of stars in NGC 6530No.Star numbermeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpUBVlSpectral type from UBV data from literaturesrc.spTypecharSpUBVnSpectral type from new UBV datasrc.spTypecharSpWalrSpectral type from new Walraven datasrc.spTypecharSpIDSSpectral type from IDS spectrumsrc.spTypecharSpCCDSpectral type from CCD spectrumsrc.spTypecharSpAdopAdopted spectral typesrc.spTypecharE(B-V)B-V colour excessmagphot.color.excessfloatExtinct? Ratio of visual to selective extinctionphys.absorption.gal;arith.ratiofloatnullableu_ExtinctUncertainty flag on extinctmeta.code.errorcharDistPhotometric distancekpcpos.distancefloatlogTefflog of effective temperatureKphys.temperature.effectivefloatlogLlog of stellar luminositysolLumphys.luminosityfloatIRexcessPresence of infrared excess (YES/NO)meta.notechar