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epsilon Lupi: measuring the heartbeat of a doubly magnetic massive binary with BRITE Constellation
Amer Assoc Variable Star Observers, 49 Bay State Rd, Cambridge, MA 02138 USA.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA.
CALTECH, TAPIR, Walter Burke Inst Theoret Phys, Mailcode 350-17, Pasadena, CA 91125 USA;Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Kohn Hall, Santa Barbara, CA 93106 USA.
Royal Mil Coll Canada, Dept Phys & Space Sci, Kingston, ON K7K 7B4, Canada.
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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, 647383Available from: 2019-10-11 Created: 2019-10-11 Last updated: 2019-10-11Bibliographically approved

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