Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12.1109s&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August
Astronomy and Astrophysics
Astrophysics
Aldebaran, Pollux, Procyon, Crd, Prd, Hydrogen
Scientific paper
The effects of partial redistribution (PRD) in the formation of the hydrogen Lyman α and β lines are discussed with reference to simple atmospheric models of several late-type stars at different evolutionary stages. Radiative transfer calculations have been carried out using Carlsson's MULTI code which has been modified to include PRD by Hubeny & Lites. It is demonstrated that there is a rapid escalation in the importance of PRD in stars with surface gravity lower than the Sun, and that line profiles predicted using PRD are in significantly better agreement with observations than are those calculated assuming complete redistribution (CRD). The effects of PRD in H Lyman α on calculations of ion{Fe}{2} fluorescent spectra are examined, and it is found that there are significant, systematic differences between fluorescent spectra calculated using a PRD rather than CRD treatment of the pumping line.
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