Semiclassical Approximation of Low-Degree Stellar p Modes
Abstract
Semiclassical description of the adiabatic acoustic oscillations is developed and its accuracy is addressed in different approximations. For modes of low degree ell, the semiclassical analysis suggests an expansion in powers of ell+1/2 in the eigenfrequency equation, as an alternative to the standard expansion in powers of 1/ω given by the high-frequency asymptotic analysis. New eigenfrequency equation demonstrates far superior accuracy in matching the oscillation frequencies, even when the applicability of the semiclassical analysis is significantly violated locally in the core of a centrally-condenced star. We discuss the diagnostic capabilities of this approximate description by applying it to solar p-mode data.
- Publication:
-
Structure and Dynamics of the Interior of the Sun and Sun-like Stars
- Pub Date:
- 1998
- Bibcode:
- 1998ESASP.418..527R