http://arxiv.org/abs/2210.01453
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.
A. Schootemeijer, D. Lennon, M. Garcia, et. al.
Wed, 5 Oct 22
51/73
Comments: Conference proceedings for a talk in IAU Symposium 361: Massive Stars Near and Far, Ballyconnell, Ireland, 9-13 May 2022
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