Abstract
Using the Brussels population synthesis code which includes a reali0073tic fraction of close binaries, we study the effect of massive stars on spectral properties of starburst regions, for the metallicities Z=0.02 and 0.001. We conclude that binary interaction may cause a so called ’rejuvenation’ of a starburst, producing a stellar population seemingly younger than in reality. The consequences for the age determination of these objects through W Hβ are discussed. We then discuss the properties of the red and blue ’Wolf-Rayet bump’ in the spectra of some extra-galactic star-bursts and we argue that a comparison between theory and observation seems to require the presence of a non-negligible amount of interacting binaries. Finally, we show the results of theoretical modelling of the hard X-ray luminosity produced by a starburst (due to high mass X-ray binaries (HMXBs) and young supernova remnants (YSNRs)) as a function of its age.
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Van Bever, J., Vanbeveren, D. (2001). Massive Star Population Synthesis of Starbursts. In: Vanbeveren, D. (eds) The Influence of Binaries on Stellar Population Studies. Astrophysics and Space Science Library, vol 264. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9723-4_30
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DOI: https://doi.org/10.1007/978-94-015-9723-4_30
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