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Stellar multiplicity in the Milky Way Galaxy

Published online by Cambridge University Press:  02 August 2018

E. Stonkutė ,
R. P. Church ,
S. Feltzing  and
J. A. Johnson
E. Stonkutė
Affiliation:
Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio al. 3, LT-10222, Vilnius, Lithuania. Email: edita.stonkute@tfai.vu.lt Lund Observatory, Department of Astronomy and Theoretical Physics, Box 43, SE-22100, Lund, Sweden
R. P. Church
Affiliation:
Lund Observatory, Department of Astronomy and Theoretical Physics, Box 43, SE-22100, Lund, Sweden
S. Feltzing
Affiliation:
Lund Observatory, Department of Astronomy and Theoretical Physics, Box 43, SE-22100, Lund, Sweden
J. A. Johnson
Affiliation:
The Ohio State University, Columbus, OH 43210, USA
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Abstract

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We present our models of the effect of binaries on high-resolution spectroscopic surveys. We want to determine how many binary stars will be observed, whether unresolved binaries will contaminate measurements of chemical abundances, and how we can use spectroscopic surveys to better constrain the population of binary stars in the Galaxy. Using a rapid binary-evolution algorithm that enables modelling of the most complex binary systems we generate a series of large binary populations in the Galactic disc and evaluate the results. As a first application we use our model to study the binary fraction in APOGEE giants. We find tentative evidence for a change in binary fraction with metallicity.

Keywords

general–surveys–methods: analytical–methods: statistical–binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 366 - 367
Copyright
Copyright © International Astronomical Union 2018 

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