Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245...18a&link_type=abstract
Astrophysical Journal, Part 1, vol. 245, Apr. 1, 1981, p. 18-24.
Astronomy and Astrophysics
Astronomy
41
Astronomical Photometry, Galactic Clusters, Galactic Evolution, Hertzsprung-Russell Diagram, Infrared Astronomy, Virgo Galactic Cluster, Giant Stars, Metallic Stars, Stellar Evolution
Scientific paper
Recently published IR photometry of early-type galaxies in Virgo and Coma is used to study the IR color-magnitude (C-M) relations in these clusters. It is found that the relative distance moduli between Virgo and Coma derived from the u-V, u-K, and V-K colors are delta m = 3.5 + or - 0.2, 3.0 + or - 0.2, and 2.6 + or - 0.3 mag, respectively. The differences in these values provide evidence that the C-M effect does not have a universal form. It is suggested that many Coma galaxies lost their gas content before the formation of a cool, stellar component found in Virgo (and galaxies not in rich clusters) could occur. This cool component might consist either of very metal-rich stars or very red intermediate-age giants.
Aaronson Marc
Frogel Jay. A.
Persson Eric S.
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