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Hunting for red supergiant binaries: UVIT photometry of the SMC

Published online by Cambridge University Press:  29 August 2024

Lee R. Patrick Open the ORCID record for Lee R. Patrick [Opens in a new window] ,
David Thilker ,
Danny Lennon ,
Luciana Bianchi ,
Abel Schootemeijer Open the ORCID record for Abel Schootemeijer [Opens in a new window] ,
Ricardo Dorda ,
Norbert Langer Open the ORCID record for Norbert Langer [Opens in a new window]  and
Ignacio Negueruela Open the ORCID record for Ignacio Negueruela [Opens in a new window]
Lee R. Patrick*
Affiliation:
Departamento de Física Aplicada, Universidad de Alicante, E-03690 San Vicente del Raspeig, Alicante, Spain School of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
David Thilker
Affiliation:
Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
Danny Lennon
Affiliation:
Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain Universidad de La Laguna, Dpto. Astrofísica, E-38206 La Laguna, Tenerife, Spain
Luciana Bianchi
Affiliation:
Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
Abel Schootemeijer
Affiliation:
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121, Bonn, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany
Ricardo Dorda
Affiliation:
Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
Norbert Langer
Affiliation:
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121, Bonn, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121, Bonn, Germany
Ignacio Negueruela
Affiliation:
Departamento de Física Aplicada, Universidad de Alicante, E-03690 San Vicente del Raspeig, Alicante, Spain
*
email: lee@lrp-astro.org
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Abstract

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. We present UVIT/Astrosat UV photometry of the RSG population of the Small Cloud galaxy (SMC). As RSGs are extremely faint in the far-UV, these observations directly probe potential companion stars. From a sample of 861 SMC RSGs, we find 88 have detections at far-UV wavelengths: a clear signature of binarity. Stellar parameters are determined for both components, which allows us to study - for the first time - the mass-ratio (q) distribution of RSG binary systems. We find a flat mass-ratio distribution best describes the observations up to MRSG ∼15M⊙. We account for our main observing bias (i.e. the limiting magnitude of the UVIT survey) to determine the intrinsic RSG binary fraction of 18.8 ± 1.5 %, for mass-ratios in the range 0.3.<q<1.0 and orbital periods approximately in the range 3<log P[days]<8.

Keywords

stars: late-typestars: binariesgalaxies: Magellanic Clouds
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 279 - 285
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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