Computer Science
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.307.1008s&link_type=abstract
Monthly Notices, Volume 307, Issue 4, pp. 1008-1022.
Computer Science
21
Scientific paper
The observed abundance anomalies for iron-group elements in atmospheres of HgMn stars are due to diffusive movements which are driven by radiation-pressure forces and which persist in the stellar envelopes, going down to regions with temperatures of about 10^6K. Studies of diffusion in the envelopes are required both in order to understand the observed atmospheric abundances and in order to calculate the changes in opacities that result from changes in abundances. Let tau be the Rosseland-mean optical depth. It is shown that one can define an upper boundary, tautau_u, such that one can obtain solutions for the diffusive movements in the region of tau>=tau_u without any knowledge of what happens in the higher layers of tau
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