Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985stin...8535840r&link_type=abstract
Semiannual Progess Report, 1 Nov. 1984 - 30 Apr. 1985 Smithsonian Astrophysical Observatory, Cambridge, MA.
Astronomy and Astrophysics
Astrophysics
Interstellar Gas, Line Spectra, Nonlinearity, Photosphere, Scattering, Stellar Atmospheres, Stellar Spectra, Stellar Winds, Charged Particles, Mathematical Models, Perturbation, Radiation Distribution
Scientific paper
The linear instability of line-driven stellar winds to take proper account of the dynamical effect of scattered radiation were analyzed. It is found that: (1) the drag effect of the mean scattered radiation does greatly reduce the contribution of scattering lines to the instability at the very base of the wind, but the instability growth rate associated with such lines rapidly increases as the flow moves outward from the base, reaching more than 50% of the growth rate for pure absorption lines within a stellar radius of the surface, and eventually reaching 80% of that rate at large radii; (2) perturbations in the scattered radiation field may be important for the propagation of wind disturbances, but they have little effect on the wind instability; and (3) the contribution of strongly shadowed lines to the wind instability is often reduced compared to that of unshadowed lines, but their overall effect is not one of damping in the outer parts of the wind. It is concluded that, even when all scattering effects are taken into account, the bulk of the flow in a line-driven stellar wind is still highly unstable.
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