Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.157..291d&link_type=abstract
(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno
Astronomy and Astrophysics
Astrophysics
14
Astronomical Models, Dwarf Galaxies, Galactic Evolution, Irregular Galaxies, Metallicity
Scientific paper
In the present evolutionary model for dwarf galaxies whose initially metal-poor, gas-rich dI galaxies evolve through bursting blue compact dwarf stages and fade from them to become dEs, the surface brightness of the galaxy increases rapidly during the bursting phase due to enhanced OB star formation. The dE galaxies form as a result of the depletion through star formation of the primordial gas fueling these processes. This evolutionary sequence accounts for the similarity in photometric structure of the different dwarf types and the differences in their star-formation rates, surface brightnesses, H I contents, and metallicities. Galaxy-fading and metallicity models can be used to reproduce the observed number ratios and the metallicity magnitude relation of local dwarf spheroidal galaxies.
Davies Jonathan I.
Phillips Steven
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