J/A+A/509/A104ivo://CDS.VizieR/J/A+A/509/A104doi:10.26093/cds/vizier.35090104CDSDelgado A.J.Djupvik A.A.Alfaro E.J.2010-12-18T14:14:42Z2010-03-28T14:11:08ZCDS 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-astronomybroad-band-photometryThe analysis of our deep UBVRIJHK photometry of Dolidze 25, located in the central area of the HII region Sh 2-284, reveals a young cluster with coeval MS and PMS populations of age 3.2-5Myr. The mass function for the optical PMS population in the mass range above 1.3-3.5M_{sun}_ is well fitted by a Salpeter mass function. On the other hand, the NIR photometry results indicate a large number of sources with H-Ks excess, practically distinct from the optical PMS candidate members. In addition, a distinctly older cluster member population of age 40Myr is suggested. The distance determined for the cluster from quantitative fits to ZAMS and isochrones (3.6kpc) is distinctly lower than previously published values. This result originates in the consistent use of low metallicity models for ZAMS fitting, applying published metallicity values for the cluster2010A&A...509A.104Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/509/A104CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/503/107 : Spitzer/IRAC view of Sh2-284 (Puga+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/509/A104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/509/A104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/509/A104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/509/A104https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/509/A104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/509/A104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/509/A104/table1 (Photometric results and membership)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/509/A104/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/509/A104/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/509/A104/table1?GETtext/xml+votable180.050000true101.219336940.218111110.0055555555555555566/222087.952274030004205e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/509/A104?format=asciiOpticalInfrareddefaultJ/A+A/509/A104/table1Photometric results and membershiprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqIdentification number (this work)meta.id;meta.mainintWEBDAIdentification number in WEBDAmeta.idint2MASSIdentification in 2MASS (HHMMSSss+DDMMSSs)meta.id;meta.maincharU-B? U-B colour index (1)magphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? Error in U-B (1)magstat.error;phot.color;em.opt.UfloatnullableB-V? B-V colour index (1)magphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? Error in B-V (1)magstat.error;phot.color;em.opt.BfloatnullableVmag? V magnitude (1)magphot.mag;em.opt.Vfloatnullablee_Vmag? Error in Vmag (1)magstat.error;phot.mag;em.opt.VfloatnullableV-Rc? V-Rc colour index (1)magphot.color;em.opt.V;em.opt.Rfloatnullablee_V-Rc? Error in V-Rc (1)magstat.error;phot.color;em.opt.VfloatnullableV-Ic? V-Ic colour index (1)magphot.color;em.opt.V;em.opt.Ifloatnullablee_V-Ic? Error in V-Ic (1)magstat.error;phot.color;em.opt.VfloatnullableJmag? J magnitude (1)magphot.mag;em.IR.Jfloatnullablee_Jmag? Error in Jmag (1)magstat.error;phot.mag;em.IR.JfloatnullableHmag? H magnitude (1)magphot.mag;em.IR.Hfloatnullablee_Hmag? Error in Hmag (1)magstat.error;phot.mag;em.IR.HfloatnullableKmag? K magnitude (1)magphot.mag;em.IR.Kfloatnullablee_Kmag? Error in Kmag (1)magstat.error;phot.mag;em.IR.KfloatnullableMm? Membership assignment (2)meta.code.memberintnullableIRex? NIR excess status (3)phot.color.excessintnullableRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main