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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. Hurley21 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
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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