The Sun as an Equation-of-State Laboratory

Details The Sun as an Equation-of-State Laboratory The Sun as an Equation-of-State Laboratory

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apjs..127..287d&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 127, Issue 2, pp. 287-292.

Astronomy and Astrophysics

Astronomy

8

Atomic Processes, Equation Of State, Sun: Interior, Sun: Oscillations

Scientific paper

Thanks to helioseismology, the equation of state of the plasma of the solar interior can be diagnosed. Although the gas in the solar interior is only weakly coupled and weakly degenerate, the great observational accuracy of the helioseismic measurements puts strong constraints on the nonideal part of the equation of state. The helioseismic verification of major nonideal effects in the equation of state of solar matter has become well established. The dominant contribution is the Coulomb pressure, conventionally described in the Debye-Hückel approximation. However, recently the increased precision of the helioseismic diagnosis has brought significant observational progress beyond the Debye-Hückel approximation. This is illustrated with the subtle effect of excited states in bound systems, in particular hydrogen.

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