Excitation and visibility of slow modes in rotating B-type stars

Details Excitation and visibility of slow modes in rotating B-type stars Excitation and visibility of slow modes in rotating B-type stars

2006-11-06

arxiv.org/abs/astro-ph/0611171v1

Mon.Not.Roy.Astron.Soc.374:248-255,2007

Astronomy and Astrophysics

Astrophysics

9 pages, 3 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.11139.x

We use the traditional approximation to describe oscillations with frequencies comparable to the angular rotation rate. Validity of this approximation in application to main-sequence B stars is discussed. Numerical results regarding mode stability and visibility are presented for a model of the Be star HD 163868. For this object, Walker et al.(2005) detected a record number of mode frequencies using data from the small space telescope MOST. Our interpretation of these data differs from that of Walker et al. In particular, we interpret peaks in the lowest frequency range as retrograde g modes. We find instability in a large number of modes that remain undetectable because of unfavourable aspect and/or effect of cancellation. There is no clear preference to excitation of prograde modes.

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