Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..226s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 2/JUL15, P. 226, 1994
Astronomy and Astrophysics
Astronomy
62
Scientific paper
We investigate further the dynamics of colliding winds in hot-star binary systems, by concentrating in this paper on the effects of the radiation pressure of both stars on the material moving between them. Naturally, the presence of a luminous binary companion tends to inhibit the wind acceleration towards the stagnation-point because the resultant radiation force is smaller than in a single star. By also considering the countervailing influence of the companion's gravitational attraction, we derive inequalities governing the stellar mass-loss flux. We find that, in close binary systems, such as V444 Cyg, the winds collide at much lower head-on velocities than those implied by the single-star models used in earlier calculations. This leads directly to lower expected X-ray luminosities and temperatures for colliding hot-star winds, and we suggest that this accounts for the longstanding discrepancies between theory and observation. Key words: hydrodynamics - radiative transfer - binaries: general - stars: early-type - stars: mass-loss - X-rays: stars.
Pollock Andy M. T.
Stevens Ian R.
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