期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 898, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/2041-8213/aba51c
关键词
Binary stars; White dwarf stars; Circumstellar disks
资金
- National Science Foundation [AST-1908026]
- GSU College of Arts and Sciences
The star system HR 6819 was recently proposed by Rivinius et al. as the site of the nearest example of a stellar-mass black hole. Their spectra show evidence of two components: a B3 III star in a 40 day orbit and a stationary B-emission line star. Based upon the orbital mass function and the lack of evidence of a spectral component with reflex orbital motion, Rivinius et al. suggested that HR 6819 is a triple system consisting of an inner B3 III star plus black hole binary orbited by a distant Be star. Here we present an alternative model based upon an examination of the H alpha emission line in their spectra. We show that the emission line displays the small reflex motion expected for the companion in the inner orbit and shows variations in profile shape related to orbital phase. This indicates that HR 6819 is a binary system consisting of a massive Be star and a low-mass companion that is the stripped down remnant of a former mass donor star in a mass transfer binary.
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