J/A+A/531/A155ivo://CDS.VizieR/J/A+A/531/A155doi:10.26093/cds/vizier.35310155CDSPerina S.Galleti S.Fusi Pecci F.Bellazzini M.Federici L.Buzzoni A.2017-06-20T13:17:30Z2011-07-05T22:20:34ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustershst-photometryWe present deep (V~28.0) BV photometry obtained with the wide field channel of the Advanced Camera for Surveys on board HST for four M31 globular clusters that were identified as candidate intermediate-age (age~1-9Gyr) by various authors, based on their integrated spectra and/or broad/intermediate-band colors. Two of them (B292 and B350) display an obvious blue horizontal branch, indicating that they are as old as the oldest Galactic globulars. On the other hand, for the other two (B058 and B337), which display red horizontal branches, it was not possible either to confirm or disconfirm the age estimate from integrated spectra. The analysis of the distribution in the spectral indices Mg2 and H{beta} of the M31 and Milky Way clusters whose horizontal branch can be classified as red or blue based on existing CMDs, strongly suggests that classical age diagnostics from integrated spectra may be significantly influenced by the HB morphology of the clusters and can lead to erroneous age-classifications. We also provide the CMD for another two clusters that fall into the field of the main targets, B336, an old and metal-poor globular with a significant population of RR-Lyrae variables, and the newly discovered B531, a cluster with a very red red giant branch.2011A&A...531A.155Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/531/A155CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/114/1488 : Globulars in M31 (Holland+ 1997)J/AcA/48/455 : Globular Clusters in M31 and M33 (Mochejska+, 1998)J/AJ/119/727 : M31 globular clusters photometry (Barmby+, 2000)J/AJ/122/2458 : M31 globular clusters from HST (Barmby+, 2001)J/A+A/416/917 : M31 globular clusters revised Bologna Catalog (Galleti+ 2004)J/A+A/471/127 : New globular clusters in M31 (Galleti+, 2007)J/AJ/133/2764 : M31 globular clusters structural parameters (Barmby+, 2007)J/ApJS/173/643 : GALEX UV photometry of M31 Globular Clusters (Rey+, 2007)J/MNRAS/392/L55 : M31 globular clusters from K-band photometry (Peacock+, 2009)J/A+A/507/1375 : HST/ACS VI data of M31 globular clusters (Perina+, 2009)http://www.bo.astro.it/M31 : Revised Bologna Catalogue of M31 globular clustershttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/531/A155https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/531/A155http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/531/A155https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/531/A155https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/531/A155http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/531/A155GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/531/A155/clusters (Cluster list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/531/A155/clusters?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/531/A155/clusters?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/531/A155/clusters?GETtext/xml+votable180.050000true10.47087540.78572220.0055555555555555566/2622 2707 27093.164426293329881e-19 4.75565502943315e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/531/A155?format=asciiOpticaldefaultJ/A+A/531/A155/clustersCluster listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharphotBrightest stars in the clustermeta.ref.urlcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSNameSimbad namemeta.idcharFileNameName of the file with cluster photometrymeta.idcharSimbadSimbad column added by the CDScharJ/A+A/531/A155/b058*Stellar Photometry of the M31 GC B058ChipACS/WFC chip numbermeta.id;instrintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification numbermeta.id;meta.mainintF435WHST/ACS F435W band magnitude (Vegamag system)magphot.mag;em.opt.Bfloate_F435Wrms uncertainty in F435Wmagstat.errorfloatF606WHST/ACS F606W band magnitude (Vegamag system)magphot.mag;em.opt.Rfloate_F606Wrms uncertainty in F606Wmagstat.errorfloatXposX pixel coordinates (1)pixpos.cartesian.xfloatYposY pixel coordinates (1)pixpos.cartesian.ydoubleJ/A+A/531/A155/b292_531Stellar Photometry of the M31 GCs B292 and B531recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification numbermeta.id;meta.mainintF435WHST/ACS F435W band magnitude (Vegamag system)magphot.mag;em.opt.Bfloate_F435Wrms uncertainty in F435Wmagstat.errorfloatF606WHST/ACS F606W band magnitude (Vegamag system)magphot.mag;em.opt.Rfloate_F606Wrms uncertainty in F606Wmagstat.errorfloatXposX pixel coordinates (1)pixpos.cartesian.xfloatYposY pixel coordinates (1)pixpos.cartesian.ydoubleChipACS/WFC chip numbermeta.id;instrintJ/A+A/531/A155/b336Stellar Photometry of the M31 GC B336recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification numbermeta.id;meta.mainintF435WHST/ACS F435W band magnitude (Vegamag system)magphot.mag;em.opt.Bfloate_F435Wrms uncertainty in F435Wmagstat.errorfloatF606WHST/ACS F606W band magnitude (Vegamag system)magphot.mag;em.opt.Rfloate_F606Wrms uncertainty in F606Wmagstat.errorfloatXposX pixel coordinates (1)pixpos.cartesian.xfloatYposY pixel coordinates (1)pixpos.cartesian.ydoubleChipACS/WFC chip numbermeta.id;instrintJ/A+A/531/A155/b337Stellar Photometry of the M31 GC B337XposX pixel coordinates (1)pixpos.cartesian.xfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification numbermeta.id;meta.mainintF435WHST/ACS F435W band magnitude (Vegamag system)magphot.mag;em.opt.Bfloate_F435Wrms uncertainty in F435Wmagstat.errorfloatF606WHST/ACS F606W band magnitude (Vegamag system)magphot.mag;em.opt.Rfloate_F606Wrms uncertainty in F606Wmagstat.errorfloatYposY pixel coordinates (1)pixpos.cartesian.ydoubleChipACS/WFC chip numbermeta.id;instrintJ/A+A/531/A155/b350Stellar Photometry of the M31 GC B350recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification numbermeta.id;meta.mainintF435WHST/ACS F435W band magnitude (Vegamag system)magphot.mag;em.opt.Bfloate_F435Wrms uncertainty in F435Wmagstat.errorfloatF606WHST/ACS F606W band magnitude (Vegamag system)magphot.mag;em.opt.Rfloate_F606Wrms uncertainty in F606Wmagstat.errorfloatXposX pixel coordinates (1)pixpos.cartesian.xfloatYposY pixel coordinates (1)pixpos.cartesian.ydoubleChipACS/WFC chip numbermeta.id;instrint