The Stellar Populations of dE Galaxies in Nearby Groups
Date
2004
Authors
Da Costa, Gary
Journal Title
Journal ISSN
Volume Title
Publisher
CSLI Publications
Abstract
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.
Description
Keywords
Keywords: Galaxies: dwarf; Galaxies: evolution; Galaxies: stellar content; Stars: Population II
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Source
Publications of the Astronomical Society of Australia
Type
Journal article