Turbulent convection and pulsation stability of stars - III. Non-adiabatic oscillations of red giants

Abstract

We have computed linear non-adiabatic oscillations of luminous red giants using a non-local and anisotropic time-dependent theory of convection. The results show that low-order radial modes can be self-excited. Their excitation is the result of radiation and the coupling between convection and oscillations. Turbulent pressure has important effects on the excitation of oscillations in red variables.

7 pages, 6 figures, published 2018 August 2

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Cited by in corpus (7)

• Modelling Long-Period Variables - I. A new grid of O-rich and C-rich pulsation models
• Asteroseismology of luminous red giants with Kepler I: Long Period Variables with radial and non-radial modes
• Modelling Long-Period Variables -- II. Fundamental mode pulsation in the nonlinear regime
• Mira variables in the Milky Way's nuclear stellar disc: discovery and classification
• From Solar-like to Mira stars: a unifying description of stellar pulsators in the presence of stochastic noise
• Self-Excited Pulsations and the Instability Strip of Long-Period Variables: the Transition from Small-Amplitude Red Giants to Semi-Regular Variables
• Modelling Stochastic Signatures in Classical Pulsators