Approximate equation of state for stellar material
Journal Article
·
· Astron. Astrophys., v. 23, no. 3, pp. 325-330
OSTI ID:4356816
A simple type of formula is described which approximates the Fermi-- Dirac integrals for electron density, pressure, and internal energy to about 0.1% or better over the entire range of their arguments; the accuracy depends on the chosen level of approximation. The method can be varied slightly to give thermodynamic quantities which, though only approximate, are entirely consistent thermodynamically li.e. satisfy Maxwell' s relations identically). The method is recommended for the rapid calculation of stellar interiors. A further simple formula is given for a very crude approximation to the effect of pressure ionization on the equation of state in stellar interiors. (auth)
- Research Organization:
- Inst. of Theoretical Astronomy, Cambridge, Eng.
- NSA Number:
- NSA-29-010955
- OSTI ID:
- 4356816
- Journal Information:
- Astron. Astrophys., v. 23, no. 3, pp. 325-330, Journal Name: Astron. Astrophys., v. 23, no. 3, pp. 325-330; ISSN AAEJA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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