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Article Dans Une Revue Open Astronomy Année : 2018

Rotation in sdB stars as revealed by stellar oscillations

Weikai Zong
Valérie van Grootel
  • Fonction : Auteur
Pierre Brassard
  • Fonction : Auteur
Gilles Fontaine
  • Fonction : Auteur

Résumé

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.
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Dates et versions

insu-03678193 , version 1 (04-09-2022)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Stephane Charpinet, Noemi Giammichele, Weikai Zong, Valérie van Grootel, Pierre Brassard, et al.. Rotation in sdB stars as revealed by stellar oscillations. Open Astronomy, 2018, 27 (1), pp.112-119. ⟨10.1515/astro-2018-0012⟩. ⟨insu-03678193⟩
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