J/AJ/113/1723ivo://CDS.VizieR/J/AJ/113/1723doi:10.26093/cds/vizier.51131723CDSKassis M.Janes K.A.Friel E.D.Phelps R.L.2023-04-06T16:50:24Z2016-07-17T21:14:58ZCDS support team

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

cds-question@unistra.fropen-star-clustersvisible-astronomybroad-band-photometryinfrared-photometryAges and distance moduli for the open clusters NGC 2204, Berkeley 39, NGC 2477, and Melotte 66 are constrained by comparing the theoretical models developed by Bertelli et al. (1994, Cat. J/A+AS/106/275) to the observed cluster color-magnitude diagrams which are based on deep CCD photometry. Out of a set of comparison models, no single isochrone was superior to the others in describing an observed color-magnitude diagram. Thus, a best fitting model was selected based not only on the match to an observed color-magnitude diagram, but also on the isochrone's agreement with adopted values for the cluster's metallicity and reddening. The range of otherwise acceptable models help quantify the age and distance modulus uncertainty of each cluster. Based on the best fitting models: * NGC 2204 is 1.6^+0.9^_-0.3_Gyr old with (m-M)_o_=13.0^+0.5^_-0.4_ , * Berkeley 39 has an age of 6^+2^_-1_Gyr with (m-M)_o_=12.9+/-0.2, * NGC 2477 is 1^+0.3^_-0.2_Gyr old with (m-M)_o=10.5^+0.4^_-0.3_ , and * Melotte 66 has an age of 4+/-1Gyr with (m-M)_o_=13.2^+0.3^_-0.1_.1997AJ....113.1723Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/113/1723CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/113/1723https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/113/1723http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/113/1723https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/113/1723https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/113/1723http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/113/1723GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/113/1723/be39vi (VI photometry in Berkeley 39)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/113/1723/be39vi?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/113/1723/be39vi?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/113/1723/be39vi?GETtext/xml+votable180.050000true116.82491639-4.684971940.005555555555555556Cone search capability for table J/AJ/113/1723/n2204vi (VI photometry in NGC 2204)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/113/1723/n2204vi?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/113/1723/n2204vi?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/113/1723/n2204vi?GETtext/xml+votable180.050000true94.01784167-18.705761110.005555555555555556Cone search capability for table J/AJ/113/1723/n2477vi (VI photometry in NGC 2477)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/113/1723/n2477vi?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/113/1723/n2477vi?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/113/1723/n2477vi?GETtext/xml+votable180.050000true118.22597917-38.457993890.005555555555555556Cone search capability for table J/AJ/113/1723/mel66vi (VI photometry in Melotte 66)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/113/1723/mel66vi?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/113/1723/mel66vi?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/113/1723/mel66vi?GETtext/xml+votable180.050000true111.75197806-47.727236940.005555555555555556Cone search capability for table J/AJ/113/1723/n2204bvi (BVI photometry in NGC 2204)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/113/1723/n2204bvi?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/113/1723/n2204bvi?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/113/1723/n2204bvi?GETtext/xml+votable180.050000true94.01784222-18.705766940.005555555555555556Cone search capability for table J/AJ/113/1723/n2477bvi (UBVI photometry in NGC 2477)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/113/1723/n2477bvi?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/113/1723/n2477bvi?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/113/1723/n2477bvi?GETtext/xml+votable180.050000true118.22598417-38.458006110.005555555555555556Cone search capability for table J/AJ/113/1723/be39bvi (UBVI photometry in Berkeley 39)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/113/1723/be39bvi?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/113/1723/be39bvi?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/113/1723/be39bvi?GETtext/xml+votable180.050000true116.8249103-4.68495310.0055555555555555565/5429 6/20903 20909 39129 39131 39347 39350 39353 393563.374502503080169e-19 3.921900021377621e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/113/1723?format=asciiOpticalInfrareddefaultJ/AJ/113/1723/be39viVI photometry in Berkeley 39SeqStar number in clustermeta.id;meta.mainintprimaryXposX-position on CCDpixpos.cartesian.x;instr.detfloatYposY-position on CCDpixpos.cartesian.y;instr.detfloatVmag[8/24.1] V-band magnitude (Landolt system)magphot.mag;em.opt.VfloatV-II-band magnitude (Landolt system)magphot.color;em.opt.V;em.opt.Ifloate_VmagError on Vmagmagstat.error;phot.mag;em.opt.Vfloate_V-IError on (V-I)magstat.error;phot.color;em.opt.VfloatnV[1/4] Number of V-band observationsmeta.numberintnI[1/3] Number of I-band observationsmeta.numberint_RAPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (declination part)degpos.eq.dec;meta.mainJ/AJ/113/1723/n2204viVI photometry in NGC 2204SeqStar number in clustermeta.id;meta.mainintprimaryXposX-position on CCDpixpos.cartesian.x;instr.detfloatYposY-position on CCDpixpos.cartesian.y;instr.detfloatVmag[8/24.1] V-band magnitude (Landolt system)magphot.mag;em.opt.VfloatV-II-band magnitude (Landolt system)magphot.color;em.opt.V;em.opt.Ifloate_VmagError on Vmagmagstat.error;phot.mag;em.opt.Vfloate_V-IError on (V-I)magstat.error;phot.color;em.opt.VfloatnV[1/4] Number of V-band observationsmeta.numberintnI[1/3] Number of I-band observationsmeta.numberint_RAPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (declination part)degpos.eq.dec;meta.mainJ/AJ/113/1723/n2477viVI photometry in NGC 2477SeqStar number in clustermeta.id;meta.mainintprimaryXposX-position on CCDpixpos.cartesian.x;instr.detfloatYposY-position on CCDpixpos.cartesian.y;instr.detfloatVmag[8/24.1] V-band magnitude (Landolt system)magphot.mag;em.opt.VfloatV-II-band magnitude (Landolt system)magphot.color;em.opt.V;em.opt.Ifloate_VmagError on Vmagmagstat.error;phot.mag;em.opt.Vfloate_V-IError on (V-I)magstat.error;phot.color;em.opt.VfloatnV[1/4] Number of V-band observationsmeta.numberintnI[1/3] Number of I-band observationsmeta.numberint_RAPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (declination part)degpos.eq.dec;meta.mainJ/AJ/113/1723/mel66viVI photometry in Melotte 66SeqStar number in clustermeta.id;meta.mainintprimaryXposX-position on CCDpixpos.cartesian.x;instr.detfloatYposY-position on CCDpixpos.cartesian.y;instr.detfloatVmag[8/24.1] V-band magnitude (Landolt system)magphot.mag;em.opt.VfloatV-II-band magnitude (Landolt system)magphot.color;em.opt.V;em.opt.Ifloate_VmagError on Vmagmagstat.error;phot.mag;em.opt.Vfloate_V-IError on (V-I)magstat.error;phot.color;em.opt.VfloatnV[1/4] Number of V-band observationsmeta.numberintnI[1/3] Number of I-band observationsmeta.numberint_RAPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (declination part)degpos.eq.dec;meta.mainJ/AJ/113/1723/n2204bviBVI photometry in NGC 2204e_B-VError on (B-B)magstat.error;phot.color;em.opt.BfloatSeqStar number in clustermeta.id;meta.mainintprimaryXposX-position on CCDpixpos.cartesian.x;instr.detfloatYposY-position on CCDpixpos.cartesian.y;instr.detfloatVmag[8/24.1] V-band magnitude (Landolt system)magphot.mag;em.opt.VfloatB-V(B-V) color index (Landolt system)magphot.color;em.opt.B;em.opt.VfloatV-I? (V-I) color index (Landolt system)magphot.color;em.opt.V;em.opt.Ifloatnullablee_VmagError on Vmagmagstat.error;phot.mag;em.opt.Vfloate_V-IError on (V-I)magstat.error;phot.color;em.opt.VfloatnV[1/4] Number of V-band observationsmeta.numberintnB[1/3] Number of I-band observationsmeta.numberintnI[0/3] Number of I-band observationsmeta.numberint_RAPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (declination part)degpos.eq.dec;meta.mainJ/AJ/113/1723/n2477bviUBVI photometry in NGC 2477SeqStar number in clustermeta.id;meta.mainintprimaryXposX-position on CCDpixpos.cartesian.x;instr.detfloatYposY-position on CCDpixpos.cartesian.y;instr.detfloatVmag[8/24.1] V-band magnitude (Landolt system)magphot.mag;em.opt.VfloatB-V(B-V) color index (Landolt system)magphot.color;em.opt.B;em.opt.VfloatU-B? (U-B) color index (Landolt system)magphot.color;em.opt.U;em.opt.BfloatnullableV-I? (V-I) color index (Landolt system)magphot.color;em.opt.V;em.opt.Ifloatnullablee_VmagError on Vmagmagstat.error;phot.mag;em.opt.Vfloate_B-VError on (B-B)magstat.error;phot.color;em.opt.Bfloate_U-BError on (U-B)magstat.error;phot.color;em.opt.Ufloate_V-IError on (V-I)magstat.error;phot.color;em.opt.VfloatnV[1/4] Number of V-band observationsmeta.numberintnB[1/3] Number of I-band observationsmeta.numberintnU[0/3] Number of I-band observationsmeta.numberintnI[0/3] Number of I-band observationsmeta.numberint_RAPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (declination part)degpos.eq.dec;meta.mainJ/AJ/113/1723/be39bviUBVI photometry in Berkeley 39SeqStar number in clustermeta.id;meta.mainintprimaryXposX-position on CCDpixpos.cartesian.x;instr.detfloatYposY-position on CCDpixpos.cartesian.y;instr.detfloatVmag[8/24.1] V-band magnitude (Landolt system)magphot.mag;em.opt.VfloatB-V(B-V) color index (Landolt system)magphot.color;em.opt.B;em.opt.VfloatU-B? (U-B) color index (Landolt system)magphot.color;em.opt.U;em.opt.BfloatnullableV-I? (V-I) color index (Landolt system)magphot.color;em.opt.V;em.opt.Ifloatnullablee_VmagError on Vmagmagstat.error;phot.mag;em.opt.Vfloate_B-VError on (B-B)magstat.error;phot.color;em.opt.Bfloate_U-BError on (U-B)magstat.error;phot.color;em.opt.Ufloate_V-IError on (V-I)magstat.error;phot.color;em.opt.VfloatnV[1/4] Number of V-band observationsmeta.numberintnB[1/3] Number of I-band observationsmeta.numberintnU[0/3] Number of I-band observationsmeta.numberintnI[0/3] Number of I-band observationsmeta.numberint_RAPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (II/246) ({sigma}=~0.1'') (declination part)degpos.eq.dec;meta.main