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Astron. Astrophys. 317, 949-952 (1997)

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Asymptotic analysis of linear non-adiabatic non-radial oscillation of the solar p-modes

Bi Shaolan and Li Rufeng

Yunnan Observatory, P.O.Box 110, Kunming, Yunnan 650011, P.R. China

Received 1 July 1994 / Accepted 18 June 1996


The non-adiabatic frequencies of a standard solar model are discussed in this paper. The physics describing the radiative losses is included in the non-adiabatic effects. An asymptotic approximation to the non-adiabatic non-radial p-modes of the Sun is developed. An exact solution of non-adiabatic oscillations, which results in an eigenfrequency equation with the model-dependent surface phase shift, is assumed in the outmost layers, where the asymptotic description is invalid. For the lower degree modes, the phase shift is a function of frequency alone. Compared with an adiabatic approximation, the non-adiabatic approximation of the p-mode frequencies fills more of the gap between theory and observation.

Key words: solar oscillation

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998