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Stellar Populations in Dwarf Elliptical Galaxies

  • J. Gorgas
  • S. Pedraz
  • N. Cardiel
  • J. J. Gonzalez
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 171)

Abstract

We present the results of a spectroscopic study in which we have measured line-strength indices in a sample of 5 dwarf and 2 compact elliptical galaxies (mostly from Virgo). Some conclusions about the stellar populations in dwarf E’s are derived by comparing the sample with classical E galaxies. In the adjacent figure, we plot in the Hβ-[MgFe] plane the central indices of our sample of dwarf and compact E’s together with data from González (1993, PhD Thesis). The grid represents the predictions of single-burst stellar population models from Worthey (1994, ApJS, 95,107). The main conclusion is that, whilst the central regions of giant, intermediate and compact ellipticals span, according to stellar population models, a wide range in mean stellar ages, bright dwarf ellipticals are found to be old, compatible with a ~ 10 Gyr old stellar population. This means that the dichotomy found in the Fundamental Plane between dwarf ellipticals and the gE-iE-cE sequence (Bender, Burstein & Faber 1992, ApJ, 399, 462) is also observed in the stellar populations.

Copyright information

© Springer Science+Business Media Dordrecht 1996

Authors and Affiliations

  • J. Gorgas
    • 1
  • S. Pedraz
    • 1
  • N. Cardiel
    • 1
  • J. J. Gonzalez
    • 2
  1. 1.Dpto. de AstrofísicaUniversidad ComplutenseMadridSpain
  2. 2.Instituto de AstronomíaU.N.A.M.Míxico

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