J/AJ/143/87ivo://CDS.VizieR/J/AJ/143/87doi:10.26093/cds/vizier.51430087CDSBarmby P.Jalilian F.F.2017-10-11T05:13:07Z2013-05-30T10:09:00ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustersinfrared-photometrymetallicitySeveral population synthesis models now predict integrated colors of simple stellar populations in the mid-infrared bands. To date, the models have not been extensively tested in this wavelength range. In a comparison of the predictions of several recent population synthesis models, the integrated colors are found to cover approximately the same range but to disagree in detail, for example, on the effects of metallicity. To test against observational data, globular clusters (GCs) are used as the closest objects to idealized groups of stars with a single age and single metallicity. Using recent mass estimates, we have compiled a sample of massive, old GCs in M31 which contain enough stars to guard against the stochastic effects of small-number statistics, and measured their integrated colors in the Spitzer/IRAC bands. Comparison of the cluster photometry in the IRAC bands with the model predictions shows that the models reproduce the cluster colors reasonably well, except for a small (not statistically significant) offset in [4.5]-[5.8]. In this color, models without circumstellar dust emission predict bluer values than are observed. Model predictions of colors formed from the V band and the IRAC 3.6 and 4.5{micro}m bands are redder than the observed data at high metallicities and we discuss several possible explanations. In agreement with model predictions, V-[3.6] and V-[4.5] colors are found to have metallicity sensitivity similar to or slightly better than V-K_s_.2012AJ....143...87Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/143/87CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/281 : 2MASS 6X Point Source Working Database / Catalog (Cutri+ 2006)J/A+A/531/A155 : HST photometry in six M31 globular clusters (Perina+, 2011)J/AJ/141/61 : Star clusters in M31. II. (Caldwell+, 2011)J/PASP/122/745 : HST WFPC2 star clusters in M31. III. (Hodge+, 2010)J/ApJ/725/200 : An updated catalog of M31 globular-like clusters (Fan+, 2010)J/AJ/139/1438 : SED and age estimates of 104 M31 globulars (Wang+, 2010)J/MNRAS/402/803 : M31 globular cluster system (Peacock+, 2010)J/MNRAS/392/L55 : Globulars in M31 from K-band photometry (Peacock+, 2009)J/A+A/507/1375 : HST/ACS VI data of M31 globular clusters (Perina+, 2009)J/ApJ/707/89 : Variation of mid-IR extinction (Gao+, 2009)J/AJ/137/94 : Star clusters in M31 (Caldwell+, 2009)J/ApJ/687/230 : Survey of M31 with Spitzer (Mould+, 2008)J/ApJS/177/174 : Star clusters in M31 (Narbutis+, 2008)J/ApJS/173/643 : GALEX UV photometry of M31 Globular Clusters (Rey+, 2007)J/AJ/133/2764 : M31 globular clusters structural parameters (Barmby+, 2007)J/A+A/471/127 : New globular clusters in M 31 (Galleti+, 2007)J/A+A/449/143 : Photometry of M31 globular cluster candidates (Ma+, 2006)J/AJ/131/1416 : IR Photometry of nearby globular clusters (Nantais+, 2006)J/A+A/416/917 : Revised Bologna Catalog of M31 globulars (Galleti+, 2004)J/AJ/123/2490 : RV and [Fe/H] of M31 globular cluster system (Perrett+, 2002)J/ApJ/559/851 : Young star cluster candidates in M31 (Williams+, 2001)J/AJ/122/2458 : M31 globular clusters from HST (Barmby+, 2001)J/AJ/119/727 : M31 globular clusters photometry (Barmby+, 2000)J/AcA/48/455 : Globular Clusters in M31 and M33 (Mochejska+, 1998)J/AJ/114/1488 : Globulars in M31 (Holland+ 1997)http://www.bo.astro.it/M31 : M31 Globular Clusters Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/143/87https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/143/87http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/143/87https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/143/87https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/143/87http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/143/87GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/143/87/table1 (IRAC photometry for massive M31 globular clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/143/87/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/143/87/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/143/87/table1?GETtext/xml+votable180.050000true10.110291741.45738890.0055555555555555566/2622 2623 2666 2704 2708 27092.0616683193919197e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/143/87?format=asciiInfrareddefaultJ/AJ/143/87/table1IRAC photometry for massive M31 globular clustersSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGlobular cluster name (1)meta.id;meta.mainchar[3.6][11.03/13.72] Spitzer/IRAC 3.6{mu}m 3.66" aperture flux in Vega system, extinction corrected (2) (4)magphot.mag;em.IR.3-4umfloate_[3.6]Uncertainty on [3.6]magstat.errorfloat[4.5][11.11/13.74] Spitzer/IRAC 4.5{mu}m 3.66" aperture flux in Vega system, extinction corrected (4) (2)magphot.mag;em.IR.4-8umfloate_[4.5]Uncertainty on [4.5]magstat.errorfloat[5.8][10.95/13.73] Spitzer/IRAC 5.8{mu}m 3.66" aperture flux in Vega system, extinction corrected (2) (4)magphot.flux.density;em.IR.4-8umfloate_[5.8]Uncertainty on [5.8]magstat.errorfloat[8.0][10.67/13.74] Spitzer/IRAC 8.0{mu}m 3.66" aperture flux in Vega system, extinction corrected (2) (4)magphot.flux.density;em.IR.8-15umfloate_[8.0]Uncertainty on [8.0]magstat.errorfloatKs[10.61/13.16]? 2MASS Ks photometry (3) (5)magphot.mag;em.IR.Kfloatnullablef_Ks[cd] globular near a bright source (6)meta.codechare_Ks? Uncertainty on FKsmagstat.errorfloatnullable[3.6]a[10.55/12.98]? Spitzer/IRAC 3.6{mu}m 12.2" aperture flux in Vega system, extinction corrected (4) (3)magphot.mag;em.IR.3-4umfloatnullablee_[3.6]a? Uncertainty on [3.6]amagstat.errorfloatnullable[4.5]a[10.57/12.95]? Spitzer/IRAC 4.5{mu}m 12.2" aperture flux in Vega system, extinction corrected (3) (4)magphot.mag;em.IR.4-8umfloatnullablee_[4.5]a? Uncertainty on [4.5]amagstat.errorfloatnullable[Fe/H]Metallicitylog(Sun)phys.abund.ZfloatE(B-V)The E(B-V) color excess (7)magphot.color.excessfloat_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main