Other
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.1908p&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #19.08; Bulletin of the American Astronomical Society, Vol. 27, p.1312
Other
Scientific paper
The heavy elements, platinum, gold, mercury, and thallium, which are apparently overabundant by factors of 10(3) --10(5) in many peculiar B stars, also can show strong ionization anomalies, with abundances as determined from different ionization stages differing by as much as 1 dex. It is currently unclear whether such ionization anomalies are simply the result of non-LTE effects, or if they provide evidence for chemical stratification within the photosphere. To evalulate the expected non-LTE effects, we are constructing model ions for Tl II, Tl III, Hg I, Hg II, and Hg III. Much of the necessary atomic data is being calculated using a combination of accurate, large-scale multi-configurational Dirac-Fock calculations for the most critical transitions, and Cowan code calculations for a larger set of transitions. The resulting statistical equilibrium level populations have been calculated for several of these ions using a model atmosphere of the chemically peculiar star chi Lupi. We discuss the implications of these calculations for line formation and abundance determinations in chi Lupi and other peculiar B stars.
Brage Tomas
Leckrone David
Proffitt Charles R.
Wahlgren Glenn Michael
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