Effects of binary interactions on the color evolution of M33  

作　　者：KANG XiaoYu ZHANG FengHui ZHANG Yu 

机构地区：[1]National Astronomical Observatories, Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China [2]Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China [3]Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第8期1505-1509,共5页中国科学:物理学、力学、天文学(英文版)

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11033008 and 10821061);the Chinese Academy of Sciences (Grant No. KJCX2-YW-T24)

摘　　要：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.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.

关 键 词：M33 EVOLUTION binary stars 

分 类 号：P156[天文地球—天文学]