Abstract
In this work, predictions of the spectral energy distribution from populations of single and binary stars are incorporated into a galactic chemical and color evolution model to explore the significance of the effects of the binary interactions on the color evolution of M33. We first constructed a model without binary interactions, and the model is able to reproduce most of the available observational constraints on the distribution of stellar parameters. We then run simulations with the same set of model parameters but with binary interactions considered. By comparing the results for the populations with and without binary interactions, we find that the inclusion of binary interactions makes the surface brightness greater (∼0.1 mag arcsec−2) in FUV-band but smaller (∼0.7 mag arcsec−2) in K-band, while it results in the FUV-K color bluer (∼0.8 mag). To reproduce the observations, a model that considers the binary interactions should make more gas fall onto the disk in the early time of the galaxy evolution, or increase the total stellar mass, or both.
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Kang, X., Zhang, F. & Zhang, Y. Effects of binary interactions on the color evolution of M33. Sci. China Phys. Mech. Astron. 55, 1505–1509 (2012). https://doi.org/10.1007/s11433-012-4818-2
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DOI: https://doi.org/10.1007/s11433-012-4818-2