Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.2603g&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #26.03; Bulletin of the American Astronomical Society, Vol. 30, p.850
Astronomy and Astrophysics
Astronomy
Scientific paper
Sobolev opacity in a hot-star wind preferentially scatters photons that are incident along the direction of steepest velocity gradient. This non-isotropic response can rotate the force vector relative to the direction of net radiative flux, in a manner analogous to the way a non-isotropic sail and keel can allow a boat to sail upwind. For hot star binaries, the curious feedback between the radiative forces and the flows they drive allows for counter-intuitive self-consistent solutions. For example, we show that illumination that is purely external to a reflecting radiative-equilibrium atmosphere can ablate a highly tilted and fast wind, loosely reminiscent of ``tacking'' in the sailing analogy. The conclusion is that whenever the radiation source geometry is complicated, the non-isotropic nature of Sobolev opacity must be carefully accounted for to obtain even a qualitative understanding of the atmospheric response. Thus CAK theory continues to reveal new surprises even in its most basic formulation.
Cranmer Steven
Gayley Ken
Owocki Stanley
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