Statistics – Computation
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..295p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. 295-313.
Statistics
Computation
129
Hot Stars, Hydrogen Ions, Stellar Luminosity, Stellar Radiation, Stellar Winds, Thermodynamic Equilibrium, Computational Astrophysics, Ion Production Rates, Statistical Analysis, Zinc
Scientific paper
Multilevel statistical equilibrium calculations for the dominant ions of H to Zn in hot star stellar winds have been performed, comprising 133 ionization stages of 26 elements with a total of 400 levels and 10,000 radiative bound-bound transitions. Non-LTE effects are shown to be significant, and an important back reaction of the improved occupation numbers on the wind dynamics is found. A cool wind model for Zeta Pup can account for high ionization species including O VI, S VI, and N V, while application of the calculations for the case of Tau Sco produces sufficient N V but only marginal O VI. The collision free two-level approximation for particle densities greater than 10 to the 10th/cu cm is found, for excited levels, to be poor.
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