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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Triple system HD 201433 with a SPB star component seen by BRITE - Constellation: Pulsation, differential rotation, and angular momentum transfer
Astronomy and Astrophysics, Volume 603, Article A13, Year 2017
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Description
Context. Stellar rotation affects the transport of chemical elements and angular momentum and is therefore a key process during stellar evolution, which is still not fully understood. This is especially true for massive OB-type stars, which are important for the chemical enrichment of the Universe. It is therefore important to constrain the physical parameters and internal angular momentum distribution of massive OB-type stars to calibrate stellar structure and evolution models. Stellar internal rotation can be probed through asteroseismic studies of rotationally split non radial oscillations but such results are still quite rare, especially for stars more massive than the Sun. The slowly pulsating B9V star HD 201433 is known to be part of a single-lined spectroscopic triple system, with two low-mass companions orbiting with periods of about 3.3 and 154 days. Aims. Our goal is to measure the internal rotation profile of HD 201433 and investigate the tidal interaction with the close companion. Methods. We used probabilistic methods to analyse the BRITE - Constellation photometry and radial velocity measurements, to identify a representative stellar model, and to determine the internal rotation profile of the star. Results. Our results are based on photometric observations made by BRITE - Constellation and the Solar Mass Ejection Imager on board the Coriolis satellite, high-resolution spectroscopy, and more than 96 yr of radial velocity measurements. We identify a sequence of nine frequency doublets in the photometric time series, consistent with rotationally split dipole modes with a period spacing of about 5030 s. We establish that HD 201433 is in principle a solid-body rotator with a very slow rotation period of 297 ± 76 days. Tidal interaction with the inner companion has, however, significantly accelerated the spin of the surface layers by a factor of approximately one hundred. The angular momentum transfer onto the surface of HD 201433 is also reflected by the statistically significant decrease of the orbital period of about 0.9 s during the last 96 yr. Conclusions. Combining the asteroseismic inferences with the spectroscopic measurements and the orbital analysis of the inner binary system, we conclude that tidal interactions between the central SPB star and its inner companion have almost circularised the orbit. They have, however, not yet aligned all spins of the system and have just begun to synchronise rotation. © ESO, 2017.
Authors & Co-Authors
Kallinger, Thomas
Austria, Vienna
Universität Wien
Weiss, Werner W.
Austria, Vienna
Universität Wien
Beck, Paul G.
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Pigulski, Andrzej
Poland, Wroclaw
University of Wroclaw
Kuschnig, Rainer
Austria, Vienna
Universität Wien
Austria, Graz
Technische Universitat Graz
Tkachenko, Andrew
Belgium, Leuven
Ku Leuven
Ryabchikova, Tatiana A.
Russian Federation, Moscow
Russian Academy of Sciences
Lüftinger, Theresa
Austria, Vienna
Universität Wien
Pallé, Pere Lluis
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Semenko, Evgenij A.
Russian Federation, Moscow
Russian Academy of Sciences
Handler, Gerald
Poland, Warsaw
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Matthews, Jaymie M.
Canada, Vancouver
The University of British Columbia
Moffat, Anthony F.J.
Canada, Montreal
University of Montreal
Pablo, Herbert
Canada, Montreal
University of Montreal
Popowicz, Adam
Poland, Gliwice
Silesian University of Technology
Ruciński, Slavek M.
Canada, Toronto
University of Toronto
Zwintz, Konstanze
Austria, Innsbruck
Universität Innsbruck
Statistics
Citations: 44
Authors: 17
Affiliations: 15
Identifiers
Doi:
10.1051/0004-6361/201730625
ISSN:
00046361