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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz


IMPACT FACTOR 2018: 0.350

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ICV 2017: 121.03

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2543-6376
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Volume 27, Issue 1

Issues

Rotation in sdB stars as revealed by stellar oscillations

Stephane Charpinet
  • IRAP, Université de Toulouse, CNRS, UPS, CNES, 14 avenue Edouard Belin, F-31400Toulouse, France
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Noemi Giammichele
  • IRAP, Université de Toulouse, CNRS, UPS, CNES, 14 avenue Edouard Belin, F-31400Toulouse, France
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Weikai Zong / Valérie Van Grootel
  • Space sciences, Technologies sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, 19C Allée du six-août, B-4000Liège, Belgium
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Pierre Brassard / Gilles Fontaine
Published Online: 2018-07-18 | DOI: https://doi.org/10.1515/astro-2018-0012

Abstract

An interesting opportunity offered by the detection of stellar oscillations is the possibility to infer the internal rotation rate of a star through the so-called rotational splittings. Such seismic measurements remained rather scarce for hot B subdwarf (sdB) stars until the advent of space observations with the Kepler spacecraft. Nowadays, however, a number of rotation measurements have become available, offering a glimpse on the global rotational properties of sdB stars. Here, we briefly discuss what asteroseismology starts to reveal on the rotation rate of these stars. We also make connections with the internal rotation of red-giant and white-dwarf stars. In particular, we show that the very slow rotation rates derived for single sdB stars, and their similarities with the dynamical properties of the cores of red-clump stars, strongly suggest that they evolved from red-giants rather than merger events.We also point out that no more angular momentum seems to be lost by stellar cores throughout the helium burning phase until the cooling white-dwarf stage, indicating that all the braking occurs before, most likely during red-giant branch evolution.

Keywords: subdwarfs; stars:oscillation; stars:rotation; stars:evolution

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About the article

Received: 2017-10-03

Accepted: 2017-12-07

Published Online: 2018-07-18


Citation Information: Open Astronomy, Volume 27, Issue 1, Pages 112–119, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2018-0012.

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© 2018 Stephane Charpinet, published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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