Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.157..103b&link_type=abstract
(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno
Astronomy and Astrophysics
Astrophysics
Star Formation, Stellar Evolution, Stellar Spectra, Flare Stars, Galactic Nuclei, Ubv Spectra
Scientific paper
The occurrence of star formation bursts, during the pass 3 x 10 to the 9th yr, superimposed on old populations, is simulated by combining visible and near-infrared integrated spectra of star clusters with those of red galaxy nuclei. The resultant spectral evolution of the composite object is tracked for burst to old population mass ratios of 10, 1, and 0.1 percent. If a star formation burst uses 10 percent of the galaxy mass, the underlying old population will be undetectable, at least by means of integrated spectra, during 5 x 10 to the 7th yr. At intermediate ages, about 2 x 10 to the 9th yr, the burst will still contribute around 20 percent of the total optical flux. For a 1 percent mass, the burst becomes barely visible at intermediate ages; and, finally, for an 0.1 percent mass, the burst will affect the galaxy spectrum during 2 x 10 to the 7th yr only.
Alloin Danielle
Bica Eduardo
Schmidt Albrecht
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