Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..210l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. 210-212.
Astronomy and Astrophysics
Astrophysics
7
Hot Stars, Photon Beams, Resonance Scattering, Stellar Spectra, Stellar Winds, Backscattering, Line Spectra, Monte Carlo Method, Optical Thickness
Scientific paper
A strong-line limit was sought for the Caroff et al. (1972) effect, i.e., that atomically coherent resonance scattering is responsible for backscattering in monotonic velocity fields of line-driven winds of hot stars. The limit was essential to establishing the worth of extended black absorption troughs as a diagnostic for multiply monotonic flows. The incidence of photons on a plane parallel, differentially expanding stellar atmosphere was studied. The resulting radiation field was probed with Monte Carlo simulations of the escaping photons. The Caroff strong-line limit was found not to be completely backscattering due to decay at large optical thicknesses. Photons can escape after only one scatter event. The presence of black absorption troughs in circumstellar spectra is therefore not attributable to monotonic flow. Further investigations of nonmonotonic flows are recommended.
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