J/A+A/402/549ivo://CDS.VizieR/J/A+A/402/549doi:10.26093/cds/vizier.34020549CDSBaume G.Vazquez R.A.Carraro G.Feinstein A.2003-12-11T11:36:50Z2003-12-11T12:36:38ZCDS 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-photometryDeep and extensive CCD photometric observations at UBV(RI)cH{alpha} were carried out in the area of the open cluster NGC 3293. The new data set allows to see the entire cluster sequence down to Mv~+4.5, revealing that stars with Mv<-2 are evolving off the main sequence; stars with -2<Mv<+2 are located on the main sequence and stars with Mv>+2 are placed above it. According to our analysis, the cluster distance is d=2750+/-250pc (V0-Mv=12.2+/-0.2) and its nuclear age is 8+/-1Myr. NGC 3293 contains an important fraction of pre-main sequence (PMS) stars distributed along a parallel band to the ZAMS with masses from 1 to 2.5M_{sun}_ and a mean contraction age of 10Myr. This last value does not differ too much from the nuclear age estimate. If we take into account the many factors that may affect the PMS star positions on the colour-magnitude diagram, both ages can be perfectly reconciled. The star formation rate, on the other hand, suggests that NGC 3293 stars formed surely in one single event, therefore favouring a coeval process of star formation. Using the Halpha data, we detected nineteen stars with signs of Halpha emission in the region of NGC 3293, another indication that the star formation process is still active in the region. The computed initial mass function for the cluster has a slope of x=1.2+/-0.2, a bit flatter than the typical slope for field stars and similar to the values found for other young open clusters.2003A&A...402..549Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/402/549CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/402/549https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/402/549http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/402/549https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/402/549https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/402/549http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/402/549GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/402/549/table1 (Photometric catalogue of the NGC 3293 region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/402/549/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/402/549/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/402/549/table1?GETtext/xml+votable180.050000true158.9248836-58.19307780.0055555555555555566/38018 38024https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/402/549?format=asciiOpticalInfrareddefaultJ/A+A/402/549/table1Photometric catalogue of the NGC 3293 regionB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqIdentification number (this work)meta.id;meta.mainintTGHH80[3/133]? Identification number from Turner et al., 1980AJ.....85.1193T (1)meta.id.crossintnullableFM80[2/58]? Identification number from Feinstein & Marraco, 1980PASP...92..266F (2)meta.id.crossintnullableFEAS[2/43]? Identification number from Feast, 1958MNRAS.118..618F (1)meta.id.crossintnullableHM[9/541]? Identification number from Herbst & Miller, 1982AJ.....87.1478H (1)meta.id.crossintnullableXposX position in pixels (3)pixpos.cartesian.x;instr.detfloatYposY position in pixels (3)pixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.Vfloatn_VmagComments for V magnitude (4)meta.notecharU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablen_U-BComments for U-B index (4)meta.notecharn_B-VComments for B-V index (4)meta.notecharV-Rc? V-Rc colour indexmagphot.color;em.opt.V;em.opt.Rfloatnullablen_V-RcComments for V-Rc index (4)meta.notecharV-Ic? V-Ic colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablen_V-IcComments for V-Ic index (4)meta.notecharHalpha? Halpha indexmagspect.index;em.line.Halphafloatnullablen_HalphaComments for Halpha index (4)meta.notecharMembMembership assignment (5)meta.code.membercharHDHD <III/135> identificationmeta.idcharCPDCPD <I/108> identificationmeta.idcharTYCTycho <I/239> identificationmeta.idcharOtherHipparcos or IRAS identificationmeta.idchar_RAPosition (derived from Xpos, Ypos) (right ascension part)degpos.eq.ra;meta.main_DEPosition (derived from Xpos, Ypos) (declination part)degpos.eq.dec;meta.main