Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..296n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 2, April 1985, p. 296-304.
Astronomy and Astrophysics
Astrophysics
30
Elliptical Galaxies, Spectral Energy Distribution, Stellar Evolution, Ultraviolet Spectra, Binary Stars, Horizontal Branch Stars, Main Sequence Stars, White Dwarf Stars
Scientific paper
Published UV spectra of elliptical galaxies are compared with the results of population syntheses (based on HB stars, accreting white dwarfs in binary systems, or young stars forming in bursts) in an attempt to explain the observed upturn shortward of 200 nm. The results are presented in tables and spectra and discussed in detail. Good agreement is obtained either with an HB-star model with a bimodal (log Te = 4.30 and 3.75) temperature distribution, or with a young-star model which assumes high star-formation efficiency and a flatter mass function than that of the Galaxy, or with an accreting-white-dwarf model, although only the young-star model can reproduce the wide range of UV intensities seen in the observations.
Nesci Roberto
Perola Giuseppe Cesare
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