A naked-eye triple system with a nonaccreting black hole in the inner binary
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00536815" target="_blank" >RIV/67985815:_____/20:00536815 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1051/0004-6361/202038020" target="_blank" >https://doi.org/10.1051/0004-6361/202038020</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202038020" target="_blank" >10.1051/0004-6361/202038020</a>
Alternative languages
Result language
angličtina
Original language name
A naked-eye triple system with a nonaccreting black hole in the inner binary
Original language description
Several dozen optical echelle spectra demonstrate that HR 6819 is a hierarchical triple. A classical Be star is in a wide orbit with an unconstrained period around an inner 40 d binary consisting of a B3 III star and an unseen companion in a circular orbit. The radial-velocity semi-amplitude of 61.3 km s(-1) of the inner star and its minimum (probable) mass of 5.0 M-circle dot (6.3 +/- 0.7 M-circle dot) imply a mass of the unseen object of >= 4.2 M-circle dot (>= 5.0 +/- 0.4 M-circle dot), that is, a black hole (BH). The spectroscopic time series is stunningly similar to observations of LB-1. A similar triple-star architecture of LB-1 would reduce the mass of the BH in LB-1 from similar to 70 M-circle dot to a level more typical of Galactic stellar remnant BHs. The BH in HR 6819 probably is the closest known BH to the Sun, and together with LB-1, suggests a population of quiet BHs. Its embedment in a hierarchical triple structure may be of interest for models of merging double BHs or BH + neutron star binaries. Other triple stars with an outer Be star but without BH are identified - through stripping, such systems may become a source of single Be stars.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
1432-0746
e-ISSN
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Volume of the periodical
637
Issue of the periodical within the volume
May
Country of publishing house
FR - FRANCE
Number of pages
11
Pages from-to
L3
UT code for WoS article
000532409100002
EID of the result in the Scopus database
2-s2.0-85088052249