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A magnetic massive star has experienced a stellar merger

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arxiv 2404.10167 v1 pith:LQOQQRVF submitted 2024-04-15 astro-ph.SR

A. J. Frost , H. Sana , L. Mahy , G. Wade , J. Barron , J.-B. Le Bouquin , A. Mérand , F. R. N. Schneider
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T. Shenar R. H. Barbá D. M. Bowman M. Fabry A. Farhang P. Marchant N. I. Morrell J. V. Smoker
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classification astro-ph.SR
keywords magneticmassivestarsfieldsstarsystemstellarappears
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Massive stars (those larger than 8 solar masses at formation) have radiative envelopes that cannot sustain a dynamo, the mechanism that produces magnetic fields in lower-mass stars. Despite this, approximately 7\% of massive stars have observed magnetic fields, the origin of which is debated. We used multi-epoch interferometric and spectroscopic observations to characterize HD 148937, a binary system of two massive stars. We found that only one star is magnetic and that it appears younger than its companion. The system properties and a surrounding bipolar nebula can be reproduced with a model in which two stars merged (in a previous triple system) to produce the magnetic massive star. Our results provide observational evidence that magnetic fields form in at least some massive stars through stellar mergers.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. The symphony of pulsations and binarity among massive stars using HERMES spectroscopy and TESS photometry

    astro-ph.SR 2026-08 conditional novelty 6.0 of 10

    An ensemble analysis of 873 O/B stars shows photometric variability in >93%, pulsations in ~82%, and evidence of binarity in at least 14%, including 30 newly discovered eclipsing binaries.

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