Physics
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt.........9c&link_type=abstract
Ph.D. Thesis Colorado Univ., Boulder.
Physics
5
Carbon, Emission Spectra, Line Spectra, Stars, Electron States, Transfer Functions, Transition Points
Scientific paper
An analysis was made of the lines of twice-ionized Carbon, specifically lambda 5696 and 8500, in the O stars on the basis of a detailed solution of the coupled statistical-equilibrium and transfer equations for a multilevel, multiline, multi-ion ensemble. It is significant that these plane-parallel non-LTE statistical equilibrium calculations reproduce successfully the observed emission at lambda 5696 and absorption at lambda 8500. The 3p superscript 1p superscript 0 -- 3d superscript 1d transition is found to come into emission at the observed temperatures for both main sequence and low gravity objects. The equivalent widths of the emission and absorption lines agree very well with those measured for O stars. In these stars the basic physical mechanism responsible for this phenomenon is the overpopulation of 3d by means of direct recombination and cascades from upper states, with subsequent cascade to 3p. The 3p state is drained by the two-electron transitions coupling 3p to the 2 p superscript 2 (superscript 1s, supercript 1d) states, thus preventing emission in the 3s superscript 1s---3p superscript 1p superscript 0 line.
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