epsilon Lupi: measuring the heartbeat of a doubly magnetic massive binary with BRITE ConstellationMasaryk Univ, Dept Theoret Phys & Astrophys, Kotlarska 2, CZ-61137 Brno, Czech Republic.
Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France;Univ Paris Diderot, CEA, CNRS, AIM,Sorbonne Paris Cite, F-91191 Gif Sur Yvette, France;Univ Paris, Observ Paris, PSL Univ, LESIA,CNRS,Sorbonne Univ, 5 Pl Jules Janssen, F-92195 Meudon, France.
Uniwersytet Wroclawski, Inst Astron, Kopernika 11, PL-51622 Wroclaw, Poland.
Polish Acad Sci, Ctr Astron M Kopernika, Bartycka 18, PL-00716 Warsaw, Poland.
Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France.
Graz Univ Technol, Inst Commun Networks & Satellite Commun, Inffeldgasse 12, A-8010 Graz, Austria.
Univ Montreal, Dept Phys, CP 6128,Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada;Univ Montreal, CRAQ, CP 6128,Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada.
Univ Paris, Observ Paris, PSL Univ, LESIA,CNRS,Sorbonne Univ, 5 Pl Jules Janssen, F-92195 Meudon, France.
Silesian Tech Univ, Inst Automat Control, Akad 16, PL-44100 Gliwice, Poland.
Univ Toronto, Dept Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada.
Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland.
Univ Wien, Inst Astron, Turkenschanzstr 17, A-1180 Vienna, Austria.
Univ Innsbruck, Inst Astro & Teilchenphys, Technikerstr 25-8, A-6020 Innsbruck, Austria.
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2019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 488, no 1, p. 64-77Article in journal (Refereed) Published
Abstract [en]
epsilon Lupi A is a binary system consisting of two main-sequence early B-type stars Aa and Ab in a short period, moderately eccentric orbit. The close binary pair is the only doubly magnetic massive binary currently known. Using photometric data from the BRITE Constellation we identify a modest heartbeat variation. Combining the photometry with radial velocities of both components we determine a full orbital solution including empirical masses and radii. These results are compared with stellar evolution models as well as interferometry and the differences discussed. We also find additional photometric variability at several frequencies, finding it unlikely these frequencies can be caused by tidally excited oscillations. We do, however, determine that these signals are consistent with gravity mode pulsations typical for slowly pulsating B stars. Finally we discuss how the evolution of this system will be affected by magnetism, determining that tidal interactions will still be dominant.
Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2019. Vol. 488, no 1, p. 64-77
Keywords [en]
binaries: close, stars: magnetic field, stars: massive, stars: oscillations
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-394700DOI: 10.1093/mnras/stz1661ISI: 000482319700005OAI: oai:DiVA.org:uu-394700DiVA, id: diva2:1360196
Funder
EU, European Research Council, 6473832019-10-112019-10-112022-01-29Bibliographically approved