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Evolutionary Population Synthesis model with binary stars – Yunnan-II model

Published online by Cambridge University Press:  10 June 2020

F. Zhang ,
Z. Han  and
L. Li
F. Zhang
Affiliation:
National Astronomical Observatories/Yunnan Observatory, 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: [email protected]
Z. Han
Affiliation:
National Astronomical Observatories/Yunnan Observatory, 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: [email protected]
L. Li
Affiliation:
National Astronomical Observatories/Yunnan Observatory, 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: [email protected]
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Abstract

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By considering a modified version of the evolutionary population synthesis (EPS) model for stellar populations (SPs) comprising binary stars, the retrieved galaxy and HII-region parameters/properties differ from the case of neglecting binary stars. The retrieved age, stellar metallicity and mass of galaxies increase (e.g. ∼ 0.2 dex when using spectral fitting algorithm), whilst the star formation rate decreases (∼0.2 dex). The radiation fields from intermediate-age SPs with binary stars could be potentially important ionizing sources in HII regions. Under this possibility, the theoretical division between star forming galaxy and AGN on the diagnostic diagrams would move towards the up-right corner and the retrieved gaseous metallicity would decrease.

Our prediction for the birth rate of binary neutron stars in SPs ranges from 10−9 to 10−6${\M {^\minus 1_\odot}} $ yr−1 when the kick velocity is from 0 to 190 km s−1.

Keywords

galaxies: stellar contentgalaxies: fundamental parametersgalaxies: evolutionstars: neutron
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 35 - 38
Copyright
© International Astronomical Union 2020

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