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For refcode 1999MNRAS.306..199J:
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NED Abstract

Copyright by Royal Astronomical Society. 1999MNRAS.306..199J Stellar population of ellipticals in different environments: near-infrared spectroscopic observations P. A. James and B. Mobasher Accepted 1999 January 22; in original form 1998 September 15 ABSTRACT Near-infrared spectra of 50 elliptical galaxies in the Pisces, Abell 2199 and 2634 clusters, and in the general field, have been obtained. The strength of the CO (2.3-micron) absorption feature in these galaxies is used to explore the presence of an intermediate-age population (e.g. asymptotic giant branch stars) in ellipticals in different environments. We find that the strongest evidence for such a population comes from ellipticals in groups of a few members, which we interpret as the result of recent minor merging of these galaxies with later-type galaxies. Field galaxies from very isolated environments, on the other hand, show no evidence for young or intermediate-age stars as revealed by H{beta} and CO absorptions, and appear to form a very uniform, old population with very little scatter in metallicity and star formation history. Keywords:galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: stellar content - infrared: galaxies
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