M87 globular clusters BVI photometry : J/ApJS/73/671


Authors : COUTURE J. orcid , HARRIS W.E., ALLWRIGHT J.W.B. (hide) , HARRIS W.E., ALLWRIGHT J.W.B. et..al

Bibcode : 1990ApJS...73..671C (ADS) (Simbad) (Objects) (hide)

CDS Keywords : Clusters, globular; Photometry, CCD
UAT : Globular star clusters, CCD photometry

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Inserted into VizieR : 14-Mar-1995
Last modification : 09-Dec-1997

BVI photometry of globular clusters in M87 (1990)

Keywords : clusters globular - galaxies: individual (M87) - stars: abundances

Abstract:We present CCD photometry in B, V, and I for a sample of globular clusters in the Virgo central giant elliptical galaxy M87. Our measured sample comprises 270 objects brighter than V~23.4mag and with distances r>25" (>2kpc) from the center of the galaxy. In agreement with the recent study of Cohen, we find no detectable gradient of mean cluster color (metallicity) in (B-V) or (V-I) with radial distance. The cluster system does, however, display a large dispersion in color at any radius, corresponding to sigma([Fe/H])~0.6 about a mean metallicity (Fe/H]>~-1.1 according to our color index scale. The difference in mean color between the globular clusters and the underlying halo light of the galaxy itself, found previously by Strom and coworkers and by Cohen, shows up strongly in all ...(more)
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