Metal abundances for a large sample of globular clusters in M87

Details Metal abundances for a large sample of globular clusters in M87 Metal abundances for a large sample of globular clusters in M87

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..493l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 2, p. 493-506, 807-811.

Astronomy and Astrophysics

Astronomy

58

Abundance, Astronomical Photometry, Globular Clusters, Metallicity, Charge Coupled Devices, Halos, Intergalactic Media

Scientific paper

Deep integrated Washington CCD photometry of the extremely populous globular cluster system of NGC 4486 (M87) in Virgo is presented. The metallicities of 407 of the best candidates with T1 of less than 22 are estimated from the (C-T1) color. These values are internally precise to about 0.15 dex and accurate to about 0.25 dex. The mean metallicity of the globular clusters is 0.86 dex, with a formal standard error of the mean of 0.03 dex but a more realistic uncertainty of about 0.2 dex. About 10 percent of the clusters exceed solar abundance, similar to the case for the globular clusters in NGC 1399 and NGC 5128. The globular clusters display a marked gradient in both mean (M-T1) and (C-T1) color with galactocentric distance.

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