Stellar multiplicity in the Milky Way Galaxy

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 po...

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Bibliographic Details
Published in:arXiv.org 2017-08
Main Authors: Stonkute, Edita, Church, Ross P, Feltzing, Sofia, Johnson, Jennifer A
Format: Article
Language:English
Subjects:
Astronomical models
Binary stars
Evolutionary algorithms
Galactic evolution
Metallicity
Milky Way Galaxy
Organic chemistry
Space telescopes
Stellar evolution
Stellar system evolution
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1708.06348