BVI photometry of globular clusters in M87

Details BVI photometry of globular clusters in M87 BVI photometry of globular clusters in M87

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...73..671c&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 73, Aug. 1990, p. 671-683. Research supported by NSERC and Nation

Astronomy and Astrophysics

Astrophysics

101

Astronomical Photometry, Elliptical Galaxies, Globular Clusters, Stellar Spectrophotometry, Visual Photometry, Abundance, Charge Coupled Devices, Color-Color Diagram, Galactic Nuclei, Stellar Color

Scientific paper

CCD photometry in B, V, and I is presented for a sample of globular clusters in the Virgo central giant elliptical galaxy M87. No detectable gradient of mean cluster color (metallicity) in (B - V) or (V - I) with radial distance is found. The cluster system does, however, display a large dispersion in color at any radius, corresponding to sigma (Fe/H) about 0.6 about a mean metallicity of about -1.1 according to the present color index scale. The difference in mean color between the globular clusters and the underlying halo light of the galaxy itself shows up strongly in all the color indices; virtually no clusters as red as the mean color of the halo stars is found at any radius.

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