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Stellar Equations Of State

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Contact: F.X.Timmes
my one page vitae,
full vitae,
research statement, and
teaching statement.

Before using these instruments, you should glance at the journal papers that describe them. Here then are bzip2 tarballs of six stellar interior equations of state:

helmholtz.tbz nadyozhin.tbz iben.tbz
weaver.tbz arnett.tbz timmes.tbz

The Helmholtz EOS executes the fastest, displays perfect thermodynamic consistency, and has a maximum error of 1e-6. Helmholtz is the stellar EOS of choice in the FLASH software instrument and the backbone of the EOS module in the MESA instrument. The Helmholtz free energy data file spans 10-12 ≤ density (g cm-3) ≤ 1015 and 103 ≤ temperature (K) ≤ 1013. The Nadyozhin EOS is the fastest of the analytic routines, has very good thermodynamic consistency, a maximum error of 1e-5, and is avaliable in FLASH. The Timmes EOS is as slow as molasses during a North Dakota winter, but it computes the non-interacting electron-positron equation of state with no approximations, is exact to machine precision in IEEE double precision arithmetic, has excellent thermodynamic consistency, and serves as the reference point for comparisons to the other EOS routines. The Helmholtz free energy table used by the Helmholtz EOS is calculated from the Timmes EOS.

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Pressure
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Pressure differences
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Thermodynamic consistency

 



Please cite the relevant references if you publish a piece of work that use these codes, pieces of these codes, or modified versions of them. Offer co-authorship as appropriate.