Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt........12l&link_type=abstract
Thesis (PhD). THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL, Source DAI-B 61/04, p. 1990, Oct 2000, 146 pages.
Astronomy and Astrophysics
Astrophysics
4
Scientific paper
Starbursts are surmised to be key contributors to such astrophysical phenomena as the Butcher-Oemler effect and the appearance of galactic merger remnants. Characterizing the stellar populations formed in starbursts can place important constraints on the theoretical descriptions of the interactions which produced the starburst. A technique for accurately determining the ages and metallicities of post-starburst stellar populations is presented. Through integrated light spectroscopy, it uses two spectral absorption feature indices, Hδ/Fe I λ4045 and Ca II, as well as an index based on the height of the Balmer discontinuity. These indices are demonstrated to be sensitive to age for young stellar populations. The indices are able to separate the effects of burst strength from burst age in a spectrum comprised of a post-starburst population and an underlying old stellar population. Observed indices for post-starburst populations are compared to evolutionary synthesis models, which formulate the theoretical spectral index behavior as a function of age and metallicity. The method is applied to a set of stellar systems to simultaneously determine the ages and metallicities of several different types of starburst populations. The stellar systems include a sample of Magellanic Cloud star clusters, a group of recent post-starburst galaxies, and the suspected merger remnant NGC 5018. The derived ages are shown to be consistent with previous determinations.
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