61 citations · 265 across the 8 of their papers we have counts for
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Effects of Heavy Elements and Excited States in the Equation of State of the Solar Interior
Zhigang Gong, Werner Dappen, Alan Nayfonov
Although 98% of the solar material consists of hydrogen and helium, the remaining chemical elements contribute in a discernible way to the thermodynamic quantities. The contributio…
Generalized Fermi-Dirac Functions and Derivatives: Properties and Evaluation
Zhigang Gong, Ladislav Zejda, Werner Dappen +1
The generalized Fermi-Dirac functions and their derivatives are important in evaluating the thermodynamic quantities of partially degenerate electrons in hot dense stellar plasmas.…
The MHD equation of state with post-Holtsmark microfield distributions
Alan Nayfonov, Werner Dappen, David G. Hummer +1
The Mihalas-Hummer-Dappen (MHD) equation of state is a part of the Opacity Project (OP), where it mainly provides ionization equilibria and level populations of a large number of a…
Grids of stellar models. VIII. From 0.4 to 1.0 Msun at Z=0.020 and Z=0.001, with the MHD equation of state
C. Charbonnel, W. Dappen, D. Schaerer +4
We present stellar evolutionary models covering the mass range from 0.4 to 1 Msun calculated for metallicities Z=0.020 and 0.001 with the MHD equation of state (Hummer & Mihalas, 1…
Helioseismic analysis of the hydrogen partition function in the solar interior
S. Basu, W. Dappen, A. Nayfonov
The difference in the adiabatic gradient gamma_1 between inverted solar data and solar models is analyzed. To obtain deeper insight into the issues of plasma physics, the so-called…