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Dynamical vs Supernova Acceleration of OB Stars in the Small Magellanic Cloud

Published online by Cambridge University Press:  29 August 2024

M. S. Oey Open the ORCID record for M. S. Oey [Opens in a new window] ,
J. Dorigo Jones ,
G. D. Phillips ,
N. Castro ,
M. M. Dallas  and
M. Moe
M. S. Oey*
Affiliation:
University of Michigan, Astronomy Department, Ann Arbor, MI, 48109-1107, USA
J. Dorigo Jones
Affiliation:
University of Colorado, Department of Astrophysical and Planetary Sciences, 2000 Colorado Ave., Boulder, CO 80309, USA
G. D. Phillips
Affiliation:
University of Michigan, Astronomy Department, Ann Arbor, MI, 48109-1107, USA
N. Castro
Affiliation:
Leibniz-Institut für Astrophysik, An der Sternwarte, 16 D-14482, Potsdam, Germany
M. M. Dallas
Affiliation:
University of Michigan, Astronomy Department, Ann Arbor, MI, 48109-1107, USA Current address: Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
M. Moe
Affiliation:
University of Arizona, Astronomy Department, Tucson, AZ, 85721, USA
*
email: msoey@umich.edu
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Abstract

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We use the RIOTS4 sample of SMC field OB stars to determine the origin of massive runaways in this low-metallicity galaxy using Gaia proper motions, together with stellar masses obtained from RIOTS4 data. These data allow us to estimate the relative contributions of stars accelerated by the dynamical ejection vs binary supernova mechanisms, since dynamical ejection favors faster, more massive runaways, while SN ejection favors the opposite trend. In addition, we use the frequencies of classical OBe stars, high-mass X-ray binaries, and non-compact binaries to discriminate between the mechanisms. Our results show that the dynamical mechanism dominates by a factor of 2 – 3. This also implies a significant contribution from two-step acceleration that occurs when dynamically ejected binaries are followed by SN kicks. We update our published quantitative results from Gaia DR2 proper motions with new data from DR3.

Keywords

massive starsBe starsrunaway starsinteracting binary starsfield starsSmall Magellanic Cloudopen star clustersmultiple star evolution
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 82 - 87
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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