The stellar content of the A496 cD galaxy

Details The stellar content of the A496 cD galaxy The stellar content of the A496 cD galaxy

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143...46v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 46-53.

Astronomy and Astrophysics

Astronomy

6

Galaxies, Infrared Astronomy, Radiant Cooling, Star Distribution, Stellar Evolution, Halos, Main Sequence Stars, Mass To Light Ratios, Red Giant Stars, Stellar Mass Accretion

Scientific paper

J, H, and K radial color distributions obtained for the galaxy A496 cD indicate that while the halo becomes bluer at increasing radii in the B-V, it becomes redder in the visual-IR colors. The combined visual-IR data lead to a unique model for both the main sequence and giant stars in which the main sequence is characterized by a radial increase of an upper mass cutoff, and the giant population is dominated by M4-5III giants. Interpretation of these data in terms of metallicity gradients implies a young population in the halo, while the radial mass cutoff increase, together with the increasing fraction of giant stars, contradicts an aging effect as the reason for the mass cutoff. Several critical predictions of the Valentijn (1983) model, which invokes ongoing star formation out of accreted X-ray gas, are fulfilled.

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