Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 485, Issue 2, Pages 2638-2641Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz610
Keywords
binaries: close; stars: emission line, Be; stars: individual: SS433
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Funding
- Russian Science Foundation [17-12-01241]
- Program of development of M.V. Lomonosov Moscow State University (Leading Scientific School 'Physics of stars, relativistic objects and galaxies')
- Russian Science Foundation [17-12-01241] Funding Source: Russian Science Foundation
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We revisit the determination of binary mass ratio in the Galactic microquasar SS433 based on recent GRAVITY VLTI measurements of mass and angular momentum outflow through a circumbinary disc. The new observations combined with the constancy of the binary orbital period over similar to 30 yr confirm that the mass ratio in SS433 is q = M-x/M-v greater than or similar to 0.6. For the assumed optical star mass M-v ranging from similar to 8 to 15 M-circle dot such a mass ratio suggests a low limit of the compact object mass of M-x similar to 5-9M(circle dot), placing the compact object in SS433 as a stellar mass black hole.
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