A new asteroseismic diagnostic for internal rotation in γ Doradus stars

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    Rhita-Maria Ouazzani, S. J. A. J. Salmon, Institut d'Astrophysique et Géophysique de l'Université de Liège, Allée du six Août, 17, 4000, Liège, Belgium,
  • V. Antoci
  • T. R. Bedding,
  • S. J. Murphy
  • I. W. Roxburgh, Astronomy Unit, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
With four years of nearly continuous photometry from Kepler, we are finally in a good position to apply asteroseismology to γ Doradus stars. In particular, several analyses have demonstrated the possibility to detect non-uniform period spacings, which have been predicted to be directly related to rotation. In this paper, we define a new seismic diagnostic for rotation in γ Doradus stars which are too rapidly rotating to present rotational splittings. Based on the non-uniformity of their period spacings, we define the observable Σ as the slope of the period spacing when plotted as a function of period. We provide a one-to-one relation between this observable Σ and the internal rotation, which applies widely in the instability strip of γ Doradus stars. We apply the diagnostic to a handful of stars observed by Kepler. Thanks to g modes in γ Doradus stars, we are now able to determine the internal rotation of stars on the lower main sequence, which is still not possible for Sun-like stars.
Original languageEnglish
JournalRoyal Astronomical Society. Monthly Notices
Volume465
Issue number2
Pages (from-to)2294-2309
ISSN0035-8711
DOIs
StatePublished - 1 Feb 2017

    Research areas

  • asteroseismology, stars: interiors, stars: oscillations, stars: rotation

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