Driving and damping mechanisms in hybrid pressure-gravity modes pulsators

Abstract

We study the energetic aspects of hybrid pressure-gravity modes pulsations. The case of hybrid beta Cephei-SPB pulsators is considered with special attention. In addition to the already known sensitivity of the driving mechanism to the heavy elements mixture (mainly the iron abundance), we show that the characteristics of the propagation and evanescent regions play also a major role, determining the extension of the stable gap in the frequency domain between the unstable low order pressure and high order gravity modes. Finally, we consider the case of hybrid delta Sct-gamma Dor pulsators.

7 pages, 9 figures, in the proceedings of the Helas II Conference: "Helioseismology, Asteroseismology and MHD Connections", Goettingen, August 2007

References in corpus (2)

• Neon Abundances in B-Stars of the Orion Association: Solving the Solar Model Problem?
• Instability strips of SPB and beta Cephei stars: the effect of the updated OP opacities and of the metal mixture

Cited by in corpus (4)

• Impact of helium diffusion and helium-flash-induced carbon production on gravity-mode pulsations in subdwarf B stars
• The IACOB project: IV. New predictions for high-degree non-radial mode instability domains in massive stars and connection with macroturbulent broadening
• Gravitational waves from nonradial oscillations of stochastically accreting neutron stars
• Hybrid Pulsators -- Pulsating Stars with Multiple Identities