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Interferometric Detections of sdO Companions Orbiting Three Classical Be Stars

Abstract : Classical Be stars are possible products of close binary evolution, in which the mass donor becomes a hot, stripped O- or B-type subdwarf (sdO/sdB), and the mass gainer spins up and grows a disk to become a Be star. While several Be+sdO binaries have been identified, dynamical masses and other fundamental parameters are available only for a single Be+sdO system, limiting the confrontation with binary evolution models. In this work, we present direct interferometric detections of the sdO companions of three Be stars-28 Cyg, V2119 Cyg, and 60 Cyg-all of which were previously found in UV spectra. For two of the three Be+sdO systems, we present first orbits and preliminary dynamical masses of the components, revealing that one of them could be the first identified progenitor of a Be/X-ray binary with a neutron star companion. These results provide new sets of fundamental parameters that are crucially needed to establish the evolutionary status and origin of Be stars.
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https://hal-insu.archives-ouvertes.fr/insu-03705381
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Monday, June 27, 2022 - 9:05:01 AM
Last modification on : Wednesday, June 29, 2022 - 3:09:32 AM

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Robert Klement, Gail H. Schaefer, Douglas R. Gies, Luqian Wang, Dietrich Baade, et al.. Interferometric Detections of sdO Companions Orbiting Three Classical Be Stars. The Astrophysical Journal, 2022, 926, ⟨10.3847/1538-4357/ac4266⟩. ⟨insu-03705381⟩

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