On the importance of inner-shell transitions for opacity calculations

Details On the importance of inner-shell transitions for opacity calculations On the importance of inner-shell transitions for opacity calculations

2003-08-22

arxiv.org/abs/astro-ph/0308393v1

Astronomy and Astrophysics

Astrophysics

Submitted to J.Phys.B (16 pages plus 9 figure pages)

Scientific paper

10.1088/0953-4075/36/21/015

For high temperatures and densities, stellar opacities obtained from the Opacity Project (OP) were smaller than those obtained from the OPAL project. Iglesias and Rogers [Ap.J. v443, 469 (1995)] suggested that the discrepancy was due to the omission by OP of important atomic inner-shell processes, and considered in detail results for a mixture of 6 elements: H, He, C, O, S and Fe. Extensive new inner-shell data have now been computed using the code AUTOSTRUCTURE. It is shown that the inclusion of these data in the OP work gives opacities for the 6-element mix which are in much closer agreement with those from OPAL. We also discuss a number of problems relating to the calculation of opacities and of equations-of-state in dense plasmas.

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