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XSTAR: A program for calculating conditions and spectra of photoionized gases
Tim Kallman
NASA's Goddard Space Flight Center
Abstract:
XSTAR is a command-driven, interactive, computer program for calculating
the physical conditions and emission spectra of photoionized gases.
It may be applied in a wide variety of astrophysical
contexts. Stripped to essentials, its job may be described simply:
A spherical gas shell surrounding a central source of ionizing radiation
absorbs some of this radiation and reradiates it in other portions of
the spectrum; XSTAR computes the effects on the gas of absorbing this
energy, and the spectrum of reradiated light. The user supplies the
shape and strength of the incident continuum, the elemental abundances
in the gas, its density or pressure, and its thickness; the code can be
directed to return any of a large number of derived quantities,
including (but not limited to) the ionization balance and temperature,
opacity tables, and emitted line and continuum fluxes.
Subject headings: accretion -- line: formation -- plasmas --
radiation mechanisms: thermal -- radiative transfer -- X-rays: general
-- X-rays: stars
Latest Version: 1.21 (1998 October)
Archived: 1999 October 15
Papers: multiple, representative:
Turner, T. J., George, I. M., Kallman, T., Yaqoob, T., & Zycki, P. T., 1996ApJ...472..571T
Languages: Fortran
External Explanatory Pages:
ftp://legacy.gsfc.nasa.gov/software/plasma_codes/xstar/
Source Code:
xstar1.f,
rskirs.dat