Massive stars in metal-poor dwarf galaxies are often extreme rotators

Bibcode
2024IAUS..361...63S
DOI
10.1017/S1743921322002538
Schootemeijer, Abel; Lennon, Danny J.; Garcia, Miriam; Langer, Norbert; Hastings, Ben; Schürmann, Christoph
Bibliographical reference

IAU Symposium

Advertised on:
0
2024
Number of authors
6
IAC number of authors
1
Citations
0
Refereed citations
0
Description
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 Magallanic Cloud (0.5Zȯ), and ∼30% in the Small Magellanic Cloud (0.2Zȯ) as well as in the so-far unexplored metallicity range 0.1 Z/Zȯ < 0.2 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.
Type
Non-refereed
Galaxies
Magellanic Clouds

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