J/A+A/464/573ivo://CDS.VizieR/J/A+A/464/573doi:10.26093/cds/vizier.34640573CDSCarraro G.Costa E.2007-06-17T08:33:50Z2007-06-17T08:31:16ZCDS support team

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

cds-question@unistra.fropen-star-clustersccd-photometryThe stellar populations in the outer Galactic disk are a subject of wide interest nowadays. To contribute to a better picture of this part of the Galaxy, we have studied the nature of five marginally investigated star clusters (Collinder 74, Berkeley 27, Haffner 8, NGC 2509, and VdB-Hagen4) by means of accurate CCD photometry in the V and I passbands. These clusters are in fact located in the third Galactic quadrant. We aim to obtain the basic parameters of these objects, which in some cases are still disputed in the literature. In the case of VdB-Hagen 4 we provide the first estimate of its fundamental parameters, while for Haffner 8 we present the first CCD photometry. The analysis is based on the comparison between field star decontaminated color-magnitude diagrams and stellar models. Particular care is devoted to the the assessment of the data quality and the statistical field star decontamination. The Padova library of stellar isochrones is adopted in this study. The analysis we carried out allowed us to solve a few inconsistencies in the literature regarding Haffner 8 and NGC 2509. Collinder 74 is found to be significantly older than reported before. VdB-Hagen 4 is a young open cluster located more than 20kpc from the Galactic center. Such an extreme distance is compatible with the cluster belonging to the Norma-Cygnus arm.2007A&A...464..573Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/464/573CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/464/573https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/464/573http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/464/573https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/464/573https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/464/573http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/464/573GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/464/573/table1 (Photometry of Berkeley 27)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/464/573/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/464/573/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/464/573/table1?GETtext/xml+votable180.050000true102.687838065.622613610.005555555555555556Cone search capability for table J/A+A/464/573/table2 (Photometry of Haffner 8)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/464/573/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/464/573/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/464/573/table2?GETtext/xml+votable180.050000true110.70128111-12.224163060.005555555555555556Cone search capability for table J/A+A/464/573/table3 (Photometry of NGC 2509)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/464/573/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/464/573/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/464/573/table3?GETtext/xml+votable180.050000true120.25919639-18.979551940.005555555555555556Cone search capability for table J/A+A/464/573/table4 (Photometry of Collinder 74)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/464/573/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/464/573/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/464/573/table4?GETtext/xml+votable180.050000true87.11514227.25814170.005555555555555556Cone search capability for table J/A+A/464/573/table5 (Photometry of VdB-Hagen 4)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/464/573/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/464/573/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/464/573/table5?GETtext/xml+votable180.050000true114.36128083-36.018001940.0055555555555555566/21560 21562 22235 22238 23610 23685 23696 39704-39705 40601 40603-40604https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/464/573?format=asciiOpticaldefaultJ/A+A/464/573/table1Photometry of Berkeley 27recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar sequential number in the clustermeta.recordintXposX position (1)pixpos.cartesian.xdoubleYposY position (1)pixpos.cartesian.y;instr.detdoubleVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_VmagError in V magnitudemagstat.error;phot.mag;em.opt.VfloatIcmagCousins I magnitudemagphot.mag;em.opt.Ifloate_IcmagError in Ic magnitudemagstat.error;phot.mag;em.opt.Ifloat_RAPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (declination part)degpos.eq.dec;meta.mainJ/A+A/464/573/table2Photometry of Haffner 8recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar sequential number in the clustermeta.recordintXposX position (1)pixpos.cartesian.xdoubleYposY position (1)pixpos.cartesian.y;instr.detdoubleVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_VmagError in V magnitudemagstat.error;phot.mag;em.opt.VfloatIcmagCousins I magnitudemagphot.mag;em.opt.Ifloate_IcmagError in Ic magnitudemagstat.error;phot.mag;em.opt.Ifloat_RAPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (declination part)degpos.eq.dec;meta.mainJ/A+A/464/573/table3Photometry of NGC 2509recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar sequential number in the clustermeta.recordintXposX position (1)pixpos.cartesian.xdoubleYposY position (1)pixpos.cartesian.y;instr.detdoubleVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_VmagError in V magnitudemagstat.error;phot.mag;em.opt.VfloatIcmagCousins I magnitudemagphot.mag;em.opt.Ifloate_IcmagError in Ic magnitudemagstat.error;phot.mag;em.opt.Ifloat_RAPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (declination part)degpos.eq.dec;meta.mainJ/A+A/464/573/table4Photometry of Collinder 74recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar sequential number in the clustermeta.recordintXposX position (1)pixpos.cartesian.xdoubleYposY position (1)pixpos.cartesian.y;instr.detdoubleVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_VmagError in V magnitudemagstat.error;phot.mag;em.opt.VfloatIcmagCousins I magnitudemagphot.mag;em.opt.Ifloate_IcmagError in Ic magnitudemagstat.error;phot.mag;em.opt.Ifloat_RAPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (declination part)degpos.eq.dec;meta.mainJ/A+A/464/573/table5Photometry of VdB-Hagen 4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar sequential number in the clustermeta.recordintXposX position (1)pixpos.cartesian.xdoubleYposY position (1)pixpos.cartesian.y;instr.detdoubleVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_VmagError in V magnitudemagstat.error;phot.mag;em.opt.VfloatIcmagCousins I magnitudemagphot.mag;em.opt.Ifloate_IcmagError in Ic magnitudemagstat.error;phot.mag;em.opt.Ifloat_RAPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed with a comparison to UCAC2 catalog I/289 ({sigma}=0.4'') (declination part)degpos.eq.dec;meta.main