Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...417..102m&link_type=abstract
Astrophysical Journal v.417, p.102
Astronomy and Astrophysics
Astronomy
33
Galaxies: Evolution, Galaxies: Stellar Content, Stars: Evolution, Ultraviolet: Galaxies
Scientific paper
We enlarge the library of stellar evolutionary tracks compiled by Charlot & Bruzual to include a more detailed treatment of the post-asymptotic giant branch (PAGB) evolution of solar metallicity stars. The resulting set of tracks depends on the assumed relation M∫(Mi) between the zero-age main-sequence (ZAMS) mass of a star, Mi, and its mass M∫ at the end of the AGB. The isochrone synthesis spectral evolution code of Bruzual & Charlot has been used to study the possible stellar sources of the UV flux observed in elliptical galaxies, exploring the effects on the models of assuming different M∫(Mi) relations. We adopt the semiempirical relation determined by Weidemann to build the models used in this investigation. The main conclusions of our work do not depend on the adopted M∫(Mi). The UV spectra of M32, NGC 4472, NGC 3379, and NGC 4649 are examined. We conclude that whereas NGC 4472 and NGC 3379 have a UV spectrum which is consistent with that produced by a passively evolving old stellar population of solar metallicity, M32 shows definite spectral evidence that a recent major event of star formation took place in this galaxy close to 4 Gyr ago. The spectrum of NGC 4649 cannot be understood unless we assume that star formation (in minor amounts) has been going on in this galaxy until recent epochs, or that a UV bright stellar component is missing in our synthesis. Our models provide a lower limit to the total UV output from stellar populations dominated by solar metallicity stars.
Bruzual Gustavo A.
Magris Gladis C.
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