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An attempt to estimate nonideal effects on the electron partial pressure in the solar interior up to density order 5/2
Author(s) -
Meister C.V.,
Staude J.,
Pregla A.V.
Publication year - 1999
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/1521-3994(199903)320:1<43::aid-asna43>3.0.co;2-p
Subject(s) - ideal gas , debye–hückel equation , electron , real gas , physics , ideal (ethics) , equation of state , debye , electron density , thermodynamics , atomic physics , computational physics , chemistry , quantum mechanics , philosophy , electrode , epistemology , electrolyte
Helioseismology is probing the equation of state of the solar interior with ever increasing precision. Recently, even nonideal pressure modifications below 1% are being considered, mainly due to the use of different partition functions. In the present paper only the electron partial pressure has been studied, and thus no partition function was taken into account. Instead, the pressure was calculated beyond the usually applied Debye‐Hückel theory, and quantum‐mechanical electron exchange was taken into account very carefully. If the total electron pressure at distances from the solar centre larger than 0.83 solar radii could be described by equilibrium thermodynamics, it proved smaller than the value for an ideal gas due to the dominating Debye‐Hückel screening. On the contrary, at distances smaller than 0.83 solar radii electron exchange increases the total pressure up to values above the ideal pressure. Pressure modifications up to one per cent are caused by the higher‐order interactions beyond the Debye‐Hückel screening.