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T. R. Kallman, M. A. Bautista (NASA/GSFC)
We present results of calculations using the xstar version 2 computer code. This code is loosely based on the version 1 code which has been available for public use for some time. However it represents an improvement and update in several major respects, including atomic data, code structure, user interface, and improved physical description of ionization/excitation. In particular, it now is applicable to high density situations in which significant excited atomic level populations are likely to occur. We describe the code improvements, present sample runs with particular emphasis on high density situations, and discuss the application of these results to line emission from galactic binary X-ray sources and active galactic nuclei.