Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.6001g&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #60.01; Bulletin of the American Astronomical Society, Vol. 32, p.1502
Astronomy and Astrophysics
Astronomy
Scientific paper
We apply the standard CAK treatment of partially optically thick line forces to an orbiting disk around a B-type star, to delineate the parameter regimes where the radiative force may be expected to alter the global disk properties. Also, even when these radiative forces are small, we quantify the potentially important ramifications for higher-order perturbations such as one-arm mode confinement and precession of nearly circular orbits. We find that optically thick radiative forces, both radial and azimuthal, should be expected to be present in a Keplerian Be disk, and may have far-reaching implications for dynamical simulations over mode-precession timescales. Although our analysis is limited to a linear treatment of nearly circular orbits, we speculate that radiative forces may even control the saturation and nonlinear precession of observed large-amplitude one-arm modes. This work was supported in part by NASA grants NAG5-3530 and NAG5-4065.
Gayley Ken
Ignace Richard
Owocki Stanley
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