HR 6819 is a binary system with no black hole Revisiting the source with infrared interferometry and optical integral field spectroscopy

0555907 - ASÚ 2023 RIV FR eng J - Článek v odborném periodiku
Frost, A. J. - Bodensteiner, J. - Rivinius, Th. - Baade, D. - Merand, A. - Selman, F. - Abdul-Masih, M. - Banyard, G. - Bordier, E. - Dsilva, K. - Hawcroft, C. - Mahy, L. - Reggiani, M. - Shenar, T. - Cabezas, Mauricio - Hadrava, Petr - Heida, M. - Klement, R. - Sana, H.
HR 6819 is a binary system with no black hole Revisiting the source with infrared interferometry and optical integral field spectroscopy.
Astronomy & Astrophysics. Roč. 659, March (2022), č. článku L3. ISSN 0004-6361. E-ISSN 1432-0746
Institucionální podpora: RVO:67985815
Klíčová slova: Be stars * emission-line * interferometric techniques:
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 6.5, rok: 2022
Způsob publikování: Open access s časovým embargem
https://doi.org/10.1051/0004-6361/202143004

We aim to distinguish between the two scenarios for HR 6819. Both models predict two luminous stars but with very different angular separations and orbital motions. Therefore, the presence of bright sources in the 1−100 milliarcsec (mas) regime is a key diagnostic for determining the nature of the HR 6819 system. We obtained new high-angular resolution data with VLT/MUSE and VLTI/GRAVITY of HR 6819. The MUSE data are sensitive to bright companions at large scales, whilst the interferometric GRAVITY data are sensitive down to separations on mas scales and large magnitude differences. The MUSE observations reveal no bright companion at large separations and the GRAVITY observations indicate the presence of a stellar companion at an angular separation of ∼1.2 mas that moves on the plane of the sky over a timescale compatible with the known spectroscopic 40-day period.
Trvalý link: http://hdl.handle.net/11104/0330929