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Astrophysics > Solar and Stellar Astrophysics

arXiv:2209.04214 (astro-ph)
[Submitted on 9 Sep 2022]

Title:Hunting for red supergiant binaries: UVIT photometry of the SMC

Authors:L. R. Patrick, D. Thilker, D. J. Lennon, L. Bianchi, A. Schootemeijer, R. Dorda, N. Langer, I. Negueruela
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Abstract: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 M{RSG}~15 Msun. 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.
Comments: IAU Symposium 361 contribution
Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2209.04214 [astro-ph.SR]
  (or arXiv:2209.04214v1 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.2209.04214

Submission history

From: Lee Patrick [view email]
[v1] Fri, 9 Sep 2022 10:00:04 UTC (287 KB)
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