Amplitudes of low frequency modes in rotating B type stars

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

2011-11-17

arxiv.org/abs/1111.4005v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

14 pages, 6 figures, submitted to Monthly Notices of the Royal Astronomical Society

Scientific paper

Using weakly non-linear theory of oscillation, we estimate the amplitudes of low frequency modes in a slowly pulsating B (SPB) star, taking account of the effects of rotation on the modes. Applying the formulation by Schenk et al (2002), we compute 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, that is, 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.

Affiliated with

Also associated with

No associations

Rating

Amplitudes of low frequency modes in rotating B type stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Amplitudes of low frequency modes in rotating B type stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplitudes of low frequency modes in rotating B type stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-349159