A naked-eye triple system with a nonaccreting black hole in the inner binary

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

A naked-eye triple system with a nonaccreting black hole in the inner binary

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

A naked-eye triple system with a nonaccreting black hole in the inner binary

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Svazek periodika

637

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

11

Strana od-do

L3

Kód UT WoS článku

000532409100002

EID výsledku v databázi Scopus

2-s2.0-85088052249