Amplitudes of low-frequency modes in rotating B-type stars

Umin Lee

研究成果: Article査読

14 被引用数 (Scopus)


Using the weakly non-linear theory of oscillation, we estimate the amplitudes of low-frequency modes in a slowly pulsating B star, taking account of the effects of rotation on the modes. Applying the formulation by Schenk et al., we compute the non-linear coupling coefficient between the low-frequency modes and estimate the equilibrium amplitudes of the modes excited in the star, assuming the amplitudes of the unstable modes are saturated as a result of non-linear coupling with stable modes, i.e. as a result of parametric instability expected between one unstable mode and two stable modes. We use the traditional approximation to calculate adiabatic and non-adiabatic oscillations in a rotating star. We find r-modes in a rapidly rotating star play a significant role in the amplitude determination through non-linear coupling. We also find that for low-m modes, the fractional amplitudes of the radiative luminosity caused by the low-frequency modes are of order 10 -4 to 10 -3 at the surface.

ジャーナルMonthly Notices of the Royal Astronomical Society
出版ステータスPublished - 2012 3

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学


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