Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.316...71b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 316, Issue 1, pp. 71-83.
Astronomy and Astrophysics
Astronomy
18
Atomic Data, Equation Of State, Sun: Abundances, Sun: Oscillations
Scientific paper
We report the results of an asymptotic inversion of solar oscillation data for the gradient of the sound speed in the convection zone. This gradient reveals details of the non-ideal Coulomb interactions between particles, including pressure ionization. A simplified physical model is used to track down the effect of various physical assumptions in the sound-speed derivative. The model contains a calibration for the size of the H and He atoms and the He+ ion. We find that, for the pressure-ionization regions of hydrogen and helium, such a model matches the data better than any of the currently available parameter-free theories.
Baturin Vladimir A.
Dappen Werner
Gough Douglas O.
Vorontsov Sergei V.
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