Skip to Main content Skip to Navigation
Journal articles

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.
Document type :
Journal articles
Complete list of metadata
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

Links full text




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⟩



Record views