Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..106w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, no. 1, Oct. 1986, p. 106-110.
Astronomy and Astrophysics
Astrophysics
3
Early Stars, Electron Transitions, Line Spectra, Radiative Transfer, Stellar Mass Ejection, Stellar Winds, Doppler Effect, Oscillator Strengths
Scientific paper
Spectral line profiles of transitions from excited levels (N IV 955 A, N IV 1719 A, O V 1371 A), which often provide useful information for the analysis of stellar winds from early-type stars, have been calculated by using the comoving-frame technique. Contrary to the 'narrow-line limit' of the Sobolev approximation, realistic Doppler-broadening velocities (microturbulence) can be taken into account. It is demonstrated that the theoretical profiles in Sobolev approximation deviate seriously over the whole line profile from the 'exact' result obtained from comoving-frame calculations, and will lead to a systematic over-estimate of the mass loss rates when fitted to observations. The deviations are more pronounced in the case of subordinate lines than for resonance lines, because for lines from excited levels the Sobolev approximation enters additionally the estimate of the line opacity.
Hamann Wolf-Rainer
Wessolowski Ulf
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