Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.217..261c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 217, no. 1-2, p. 261-263
Astronomy and Astrophysics
Astrophysics
Galactic Evolution, Interstellar Matter, Star Formation, Star Formation Rate, Starburst Galaxies, Stellar Mass, Stellar Spectra, Absorption Spectra, Astronomical Models, Color, Elliptical Galaxies, Populations, Spectral Signatures, Stellar Spectrophotometry
Scientific paper
Observations of nearby star-forming regions suggest that the initial mass function is deficient in low-mass stars when the ambient star formation rate is high. We investigate the consequences of a truncated initial mass function on the photometric evolution of starburst galaxies using new models of stellar population synthesis. A major prediction with respect to the case of a standard initial mass function is that the spectra of the galaxies become unusually red when the turnoff mass reaches the cutoff of the initial mass function. This red phase can last for more than 109 yr if the lower cutoff is less than 2 solar mass. The amplitude of the reddening depends only weakly on the lower cutoff but increases with the fraction of the galaxy mass involved in the starburst. Such unusually red (V - K greater than 3.5) post-starburst galaxies can be distinguished from galaxies reddened by dust or with abnormally high metallicities by their unusually strong 4000 A break and the presence of stellar absorption features typical of late-type giants.
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