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Binary stars on the galaxy SFH

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

F. Zhang ,
L. Li  and
Z. Han
F. Zhang
Affiliation:
Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China email: zhangfh@ynao.ac.cn
L. Li
Affiliation:
Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China email: zhangfh@ynao.ac.cn
Z. Han
Affiliation:
Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China email: zhangfh@ynao.ac.cn
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Abstract

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Using the Yunnan-II evolutionary population synthesis models comprising binary stars, we find that the inclusion of binary stars can raise the derived stellar metallicity Z* and/or age t (degeneracy problem), raise the stellar mass M*, lower the gaseous metallicity Zgas and star formation rate (SFR) of galaxies. This means that a few stars form recently in galaxies, while more stars form during the entire evolution process when considering binary stars. If the degeneracy between t and Z* can be broken, its effect on the feedback process and star formation history can be determined.

Keywords

(stars:) binaries: generalgalaxies: evolution
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E86
Copyright
Copyright © International Astronomical Union 2016 

References

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