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Title of Journal: Astrophys Space Sci

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Abbravation: Astrophysics and Space Science

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Springer Netherlands

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DOI

10.1016/1357-4310(96)90081-7

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1572-946X

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Emulating the OPAL equation of state

Authors: HsiaoHsuan Lin Werner Däppen
Publish Date: 2010/01/22
Volume: 328, Issue: 1-2, Pages: 175-178
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Abstract

The equation of state for the structure of the Sun and stars has to be precise to allow comparisons with observations ie helioseismic inversions of thermodynamic quantities Among the two of the most popular formalisms are 1 the OPAL equation of state developed at Livermore and 2 the MihalasHummerDäppen MHD equation of state While OPAL has a solid theoretical foundation and matches the observational data better the MHD formalism is more intuitive easy to realize and has the possibility of adjustable parameters Furthermore it an opensource product in contrast to the proprietary OPAL Recently a version of MHD has been obtained by including the socalled “PlankLarkin partition function” and by adding scatteringstate terms The resulting formalism matches OPAL rather well Here we report on the next logical step the implementation of this MHD upgrade into the simple and popular CEFF equation of state Such an implementation will make it a flexible and convenient tool allowing an approximative online implementation of OPAL in solar and stellar models

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