Hunting for red supergiant binaries: UVIT photometry of the SMC

Autor:	Patrick, L. R., Thilker, D., Lennon, D. J., Bianchi, L., Schootemeijer, A., Dorda, R., Langer, N., Negueruela, I.
Rok vydání:	2022
Předmět:	Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
Popis:	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. Comment: IAU Symposium 361 contribution
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2209.04214 Zobrazit plný text záznamu View this record from Arxiv