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Date and Time of the Query: 2019-03-18 T14:36:35 PDT
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For refcode 1992ApJ...398...69W:
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1992ApJ...398...69W Mg AND Fe ABSORPTION FEATURES IN ELLIPTICAL GALAXIES GUY WORTHEY, S. M. FABER, AND J. JESUS GONZALEZ UCO/Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz, CA 95061 Received 1992 March 11; accepted 1992 April 20 ABSTRACT Fe and Mg indices from two homogenous collections of nuclear elliptical galaxy spectra are compared with model indices. In the average giant elliptical, the [Mg/Fe] ratio exceeds that of the most metal-rich stars in the solar neighborhood by ~0.2-0.3 dex, with a large spread about this mean. This result implies a variable "enrichment effectiveness" of Type II supernovae (SNs) compared with Type Ia SNs in the evolution of ellipticals, caused perhaps by differences in star formation time scales, the initial mass function, or the amount of Fe versus Mg ejected in galactic winds. Subject headings: galaxies: abundances - galaxies: elliptical and lenticular, cD - galaxies: evolution galaxies: formation - galaxies: stellar content
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