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Sub-percent binary star masses and distances from interferometric observations

Published online by Cambridge University Press:  06 February 2024

Alexandre Gallenne Open the ORCID record for Alexandre Gallenne [Opens in a new window]
Alexandre Gallenne*
Affiliation:
Universidad de Concepción, Departamento de Astronomía, Casilla 160-C, Concepción, Chile French-Chilean Laboratory for Astronomy, IRL 3386, CNRS, Casilla 36-D, Santiago, Chile
*
email: [email protected]
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Abstract

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Our knowledge of stellar evolution relies on constraints provided by measurements of the physical stellar properties such as the mass, effective temperature, and radii. The most fundamental parameter, the stellar mass, is rarely available or has a low accuracy, providing poor constraints on the stellar structure and evolution. Observing binary stars combining astrometry and spectroscopy offers the unique opportunity to measure very precise masses. In addition, double-lined spectroscopic binaries provide independent distance measurements with an extreme accuracy, allowing to test the Gaia parallaxes and the period-luminosity (P-L) relations. I will show that masses and distances with an accuracy level as high as 0.05% can be obtained by combining interferometric and spectroscopic observations for different types of binary systems, i.e. binary Cepheids, eclipsing and non-eclipsing binaries.

Keywords

Techniques: High angular resolutionInterferometricBinaries (including multiple): CloseStars: Fundamental parameters
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S376: At the crossroads of astrophysics and cosmology: Period–luminosity relations in the 2020s , December 2022 , pp. 214 - 221
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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