J/A+AS/119/221ivo://CDS.VizieR/J/A+AS/119/221CDSDeeg H.J.Ninkov Z.1999-02-27T11:22:10Z1999-02-27T12:22:03ZCDS support team

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

cds-question@unistra.fropen-star-clustersccd-photometryBased on photometry of deep CCD frames of the central region of the OB cluster Berkeley 86, we derive the cluster mass function. The absence of current star formation, and the cluster's young age of about 6Myrs, leads to the conclusion that the initial mass function (IMF) and the current mass function are identical for stars with m<10m_{sun}_. In the range of 1.2-20m_{sun}_, an IMF with a slope of {GAMMA}=-1.3+/-0.3 is found. This value agrees well with other recent determinations of young clusters IMFs which are close to the classical Salpeter IMF with {GAMMA}=-1.35. Sections of the IMF of Berkeley 86 that are significantly steeper, or flatter, are most likely the result of a dip in the star's mass distribution in the range of 3.5-10m_{sun}_. Similar dips may have led to steep IMFs over narrow mass ranges, as reported in the literature for some other clusters. No sign for a low mass turn-over in the IMF of Berkeley 86 is found for masses extending down to 0.85 m_{sun}_.1996A&AS..119..221Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/119/221CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/119/221https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/119/221http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/119/221https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/119/221https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/119/221http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/119/221GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/119/221/table1 (UBVRI photometry of 544 stars in Bky86)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/119/221/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/119/221/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/119/221/table1?GETtext/xml+votable180.050000true304.998738.67950.005555555555555556https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/119/221?format=asciiOpticaldefaultJ/A+AS/119/221/table1UBVRI photometry of 544 stars in Bky86recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1,544]+ ID number of stars in this papermeta.id;meta.mainintprimaryindexedForbes-IDID number of stars in Forbes et al. (1992AJ....103..916F) (1)meta.idcharRAJ2000+= Right Ascencion (J2000) (2)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)degpos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatU-B? U-B color indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? rms uncertainty on U-Bmagstat.errorfloatnullableB-V? B-V color indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? rms uncertainty on B-Vmagstat.errorfloatnullableV-RV-R color indexmagphot.color;em.opt.V;em.opt.Rfloate_V-Rrms uncertainty on V-Rmagstat.errorfloatR-IR-I color indexmagphot.color;em.opt.R;em.opt.Ifloate_R-Irms uncertainty on R-Imagstat.errorfloatE(B-V)E(B-V) extinctionmagphot.color.excessfloatlogM? log mass of cluster-members; 9.99= non-member; only entries for stars with V<18.5log(solMass)phys.massfloatnullable