A magnetic massive star has experienced a stellar merger
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| author | Frost, A. J. Sana, H. Mahy, L. Wade, G. Barron, J. Bouquin, J. -B. Le Mérand, A. Schneider, F. R. N. Shenar, T. Barbá, R. H. Bowman, D. M. Fabry, M. Farhang, A. Marchant, P. Morrell, N. I. Smoker, J. V. |
| author_facet | Frost, A. J. Sana, H. Mahy, L. Wade, G. Barron, J. Bouquin, J. -B. Le Mérand, A. Schneider, F. R. N. Shenar, T. Barbá, R. H. Bowman, D. M. Fabry, M. Farhang, A. Marchant, P. Morrell, N. I. Smoker, J. V. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_10167 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A magnetic massive star has experienced a stellar merger Frost, A. J. Sana, H. Mahy, L. Wade, G. Barron, J. Bouquin, J. -B. Le Mérand, A. Schneider, F. R. N. Shenar, T. Barbá, R. H. Bowman, D. M. Fabry, M. Farhang, A. Marchant, P. Morrell, N. I. Smoker, J. V. Solar and Stellar Astrophysics 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. |
| title | A magnetic massive star has experienced a stellar merger |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2404.10167 |