SI II autoionization and Fe II lines in the atmosphere of BP star

Details SI II autoionization and Fe II lines in the atmosphere of BP star SI II autoionization and Fe II lines in the atmosphere of BP star

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993coska..23...45z&link_type=abstract

Contributions of the Astronomical Observatory Skalnate Pleso, vol. 23, p. 45-49.

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Stars, Atmospheres, Chemically Peculiar

Scientific paper

The role of Si II autoionization lines around the lambda 520 nm depression is investigated using the curve of growth approach. While absorption of the Fe II ion decreases with increasing temperature, the absorption of the Si ion increases. However, absorption of the singly ionized Fe is still dominant in the depression. This is confirmed by consistent computations of synthetic spectra. The effect of atmosphere stratification in optical depths of silicon does not enhance the absorption in lambda 520 nm dominantly.

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