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The Stellar Populations of dE Galaxies in Nearby Groups* †

Published online by Cambridge University Press:  05 March 2013

G. S. Da Costa
G. S. Da Costa*
Affiliation:
Research School of Astronomy & Astrophysics, Mt Stromlo Observatory, Australian National University, Weston Creek ACT 2611, Australia. Email: [email protected]
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Abstract

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In this contribution Gemini-North NIRI J,K-observations are used to investigate the upper-Asymptotic Giant Branch (AGB) intermediate-age population in the M81 Group dwarf elliptical (dE) F8D1. Hubble Space Telescope (HST) ‘snapshot’ V,I-observations are also analysed to investigate the upper-AGB populations in two other M81 Group dEs, DDO 71 and kk077. In all three dEs, significant intermediate-age populations are found. Further, there are sizeable dE-to-dE differences in these populations: F8D1 contains relatively more, and relatively more luminous, upper-AGB stars. These results are compared with existing information for Local Group and Sculptor group dwarfs. It is suggested that ‘environmental harrassment’ plays an important role in governing dwarf galaxy evolution.

Keywords

galaxies: dwarfgalaxies: evolutiongalaxies: stellar contentstars: Population II
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Special Issue 4: Structure and Dynamics in the Local Universe , 2004 , pp. 366 - 370
Copyright
Copyright © Astronomical Society of Australia 2004

Footnotes

* Based in part on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (USA), the Particle Physics and Astronomy Research Councial (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil) and CONICET (Argentina).

† Based in part on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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