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Issue A&A Volume 367, Number 2, February IV 2001 Page(s) 513 - 520 Section Formation, structure and evolution of stars DOI 10.1051/0004-6361:20000444

A&A 367, 513-520 (2001)
DOI: 10.1051/0004-6361:20000444

On winds from giants in binary systems

A. Frankowski and R. Tylenda

Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Rabianska 8, 87-100 Torun, Poland

(Received 3 July 2000 / Accepted 4 December 2000 )

Abstract
We explore the influence of a companion on the wind from a giant in a binary system. We have developed a simple method for estimating the enhancement and intrinsic non-sphericity of the outflow in this case. Assuming the Roche model (modified to account for the reduced effective gravity of the giant), local stellar parameters ( , g) are calculated. This, according to our approach, allows to derive the local mass loss rate. The influence of varying the model parameters on the results is studied. A relation between the ratio of the stellar radius to the Roche lobe radius and the overall wind enhancement is obtained both numerically and in an analytical approximation. A similar relation is derived for the equatorial-to-polar wind intensity contrast.

Key words: binaries: general -- stars: mass-loss -- stars: late-type -- stars: AGB and post-AGB

Offprint request: A. Frankowski, frankowski@ncac.torun.pl

© ESO 2001

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