Massive stars in metal-poor dwarf galaxies are often extreme rotators
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arXiv
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| Hauptverfasser: | , , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866912124805054464 |
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| author | Schootemeijer, Abel Lennon, Danny J. Garcia, Miriam Langer, Norbert Hastings, Ben Schürmann, Christoph |
| author_facet | Schootemeijer, Abel Lennon, Danny J. Garcia, Miriam Langer, Norbert Hastings, Ben Schürmann, Christoph |
| contents | We probe how common extremely rapid rotation is among massive stars in the early universe by measuring the OBe star fraction in nearby metal-poor dwarf galaxies. We apply a new method that uses broad-band photometry to measure the galaxy-wide OBe star fractions in the Magellanic Clouds and three more distant, more metal-poor dwarf galaxies. We find OBe star fractions of ~20% in the Large Magellanic Cloud (0.5 Z_Solar), and ~30% in the Small Magellanic Cloud (0.2 Z_Solar) as well as in the so-far unexplored metallicity range from 0.1 Z_solar to 0.2 Z_solar occupied by the other three dwarf galaxies. Our results imply that extremely rapid rotation is common among massive stars in metal-poor environments such as the early universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2210_01453 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Massive stars in metal-poor dwarf galaxies are often extreme rotators Schootemeijer, Abel Lennon, Danny J. Garcia, Miriam Langer, Norbert Hastings, Ben Schürmann, Christoph Solar and Stellar Astrophysics Astrophysics of Galaxies We probe how common extremely rapid rotation is among massive stars in the early universe by measuring the OBe star fraction in nearby metal-poor dwarf galaxies. We apply a new method that uses broad-band photometry to measure the galaxy-wide OBe star fractions in the Magellanic Clouds and three more distant, more metal-poor dwarf galaxies. We find OBe star fractions of ~20% in the Large Magellanic Cloud (0.5 Z_Solar), and ~30% in the Small Magellanic Cloud (0.2 Z_Solar) as well as in the so-far unexplored metallicity range from 0.1 Z_solar to 0.2 Z_solar occupied by the other three dwarf galaxies. Our results imply that extremely rapid rotation is common among massive stars in metal-poor environments such as the early universe. |
| title | Massive stars in metal-poor dwarf galaxies are often extreme rotators |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2210.01453 |