Solar-like oscillations in massive main-sequence stars. I. Asteroseismic signatures of the driving and damping regions

Details Solar-like oscillations in massive main-sequence stars. I. Asteroseismic signatures of the driving and damping regions Solar-like oscillations in massive main-sequence stars. I. Asteroseismic signatures of the driving and damping regions

2009-11-04

arxiv.org/abs/0911.0908v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

9 pages, 14 figures, accepter in A&A

Scientific paper

Motivated by the recent detection of stochastically excited modes in the massive star V1449 Aql (Belkacem et al., 2009b), already known to be a $\beta$ Cephei, we theoretically investigate the driving by turbulent convection. By using a full non-adiabatic computation of the damping rates, together with a computation of the energy injection rates, we provide an estimate of the amplitudes of modes excited by both the convective region induced by the iron opacity bump and the convective core. Despite uncertainties in the dynamical properties of such convective regions, we demonstrate that both are able to efficiently excite $p$ modes above the CoRoT observational threshold and the solar amplitudes. In addition, we emphasise the potential asteroseismic diagnostics provided by each convective region, which we hope will help to identify the one responsible for solar-like oscillations, and to give constraints on this convective zone. A forthcoming work will be dedicated to an extended investigation of the likelihood of solar-like oscillations across the Hertzsprung-Russell diagram.

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