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

Published online by Cambridge University Press:  29 August 2024

Abel Schootemeijer Open the ORCID record for Abel Schootemeijer [Opens in a new window] ,
Danny J. Lennon ,
Miriam Garcia Open the ORCID record for Miriam Garcia [Opens in a new window] ,
Norbert Langer Open the ORCID record for Norbert Langer [Opens in a new window] ,
Ben Hastings  and
Christoph Schürmann Open the ORCID record for Christoph Schürmann [Opens in a new window]
Abel Schootemeijer*
Affiliation:
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
Danny J. Lennon
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
Miriam Garcia
Affiliation:
Centro de Astrobiología, CSIC-INTA. Crtra. de Torrejón a Ajalvir km 4, E-28850 Torrejón de Ardoz (Madrid), Spain
Norbert Langer
Affiliation:
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Ben Hastings
Affiliation:
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Christoph Schürmann
Affiliation:
Argelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
*
email: aschoot@astro.uni-bonn.de
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Abstract

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.

Keywords

stars: early-typestars: rotationgalaxies: Magellanic Clouds
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 63 - 69
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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