Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..343k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 2, Feb. 1991, p. 343-356.
Astronomy and Astrophysics
Astrophysics
27
Astronomical Models, Compact Galaxies, Dwarf Galaxies, Galactic Evolution, Starburst Galaxies, Astronomical Photometry, Chemical Evolution, Metallicity, Star Formation Rate, Stellar Evolution, Stellar Mass
Scientific paper
A number of photometric and chemical evolution models for star burst galaxies are computed. A star formation burst is superimposed on an underlying old component of red stars. The number of massive stars formed during the burst per total stellar mass is found to be the main parameter for the photometric and chemical evolution during star bursts. Color indices and chemical enrichment are independent of the duration of the burst if this is greater than about 5 million yr. The colors of the star burst galaxy differ from those of the undisturbed galaxy for a longer time in B - R than in U - B, making the latter a better indicator for the age of the burst. Stellar populations and hence color indices of the model galaxies strongly depend on the star formation rate adopted. After 15 Gyr the abundance of heavy elements is one-quarter the solar abundance, which is in the top range observed in BCDs, and can only be understood in terms of supernova-driven galactic winds not included in the current models. The observed colors of many BCDs can only be produced by models with strongly decreasing star formation rates, indicating that BCDs may be related to dwarf elliptical galaxies.
Fricke Klaus J.
Fritze-von Alvensleben Uta
Krüger Hans
Loose Hans-Hermann
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