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s-process abundances of Primary stars in the Sirius-like Systems: Constraints on pollution from AGB stars

Published online by Cambridge University Press:  30 December 2019

Y. Bharat Kumar ,
X-M. Kong ,
G. Zhao  and
J-K. Zhao
Y. Bharat Kumar
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China email: bharat@bao.ac.cn
X-M. Kong
Affiliation:
School of Mechanical, Electrical and Information Engineering, Shandong University at Weihai, Weihai 264209, China
G. Zhao
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China email: bharat@bao.ac.cn
J-K. Zhao
Affiliation:
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China email: bharat@bao.ac.cn
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Abstract

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We present the results from the abundance analysis of 21 primary stars in Sirius-like systems with various masses of white dwarf companions and orbital separation to understand the origin and nature of Ba stars. Three new Ba dwarfs are found for which masses are relatively low compared to Ba giants. Large fraction of the sample are found to be non-Ba stars, however, some of them have required WD mass and/or close orbital separation. Observed s-process abundances in Ba dwarfs are in good agreement with AGB models of respective WD companion mass, however, it required different pollution factors.

Keywords

stars: binaries (including multiple): closestars: abundancesstars: AGB
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 351 - 352
Copyright
© International Astronomical Union 2019 

References

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