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Issue A&A
Volume 415, Number 1, February III 2004
Page(s) 117 - 122
Section Galactic structure, stellar clusters and populations
DOI http://dx.doi.org/10.1051/0004-6361:20031268



A&A 415, 117-122 (2004)
DOI: 10.1051/0004-6361:20031268

Evolutionary population synthesis for binary stellar populations

F. Zhang1, Z. Han1, L. Li1 and J. R. Hurley2

1  National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, 650011, PR China
2  Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA

(Received 10 June 2003 / Accepted 8 August 2003 )

Abstract
We present integrated colours, integrated spectral energy distributions, and absorption-line indices, for instantaneous burst solar-metallicity binary stellar populations with ages in the range $1 {-} 15\,$Gyr. By comparing the results for populations with and without binary interactions we show that the inclusion of binary interactions makes the appearance of the population substantially bluer - this is the case for each of the quantities we have considered. This effect raises the derived age and metallicity of the population. Therefore it is necessary to consider binary interactions in order to draw accurate conclusions from evolutionary population synthesis work.


Key words: star: evolution -- binary: evolution -- galaxies: star clusters

Offprint request: F. Zhang, gssephd@public.km.yn.cn




© ESO 2004


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