Revisiting binary stars in population synthesis models

Abstract

We report results of a population synthesis model that follows the evolution of single and binary stars. In this model we include the 2HeWD merger channel, suggested by Han et al. (2002), for the formation of EHB stars. The physical parameters of the resulting EHB stars are derived from the BaSTI database, and are thus realistic and observationally supported. The predictions of this model are in good agreement with traditional population synthesis models, except when the spectrum of the stellar population is dominated by binary stars or their products, e.g., EHB stars in the UV of ETGs. We reproduce successfully the observed CMD and SED of the metal rich open cluster NGC 6791. The stellar population in this cluster may be archetypal of the stellar population in ETGs that show the UVX phenomenon. Our models should be appropriate to study the UV upturn in ETGs.

To appear in MNRAS. Accepted 2013 February 22. Received 2013 February 22; in original form 2012 December 20 (13 pages, 9 figures)

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• Detection of satellite remnants in the Galactic Halo with Gaia III. Detection limits for Ultra Faint Dwarf Galaxies
• Mergers of neutron stars and black holes with cores of giant stars: a population synthesis study
• UV upturn versus UV weak galaxies: differences and similarities of their stellar populations unveiled by a de-biased sample
• Mass content of UGC 6446 and UGC 7524 through HI rotation curves: deriving the stellar discs from stellar population synthesis models
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• Hidden Figures of Globular Clusters: Integrated Stellar Populations Impacted by Hot Subdwarfs
• Two categories of UV-upturn galaxies revealed by semi-analytic models
• QUEST Eclipsing Binaries and ELLISA: Eclipsing binary search in the QUEST low latitude catalogue and the ELLISA light curve simulator
• UV bright red-sequence galaxies: a comparative study between UV upturn and UV weak systems