Mass Transfer in Mira-Type Binaries

Baltic astronomy

article

S. Mohamed¹  Ph. Podsiadlowski² 

[1] Argelander Institut f¨ur Astronomie;Department of Physics, University of Oxford

关键词: stars;    binaries;    symbiotic;    accretion;    accretion disks;    hydrodynamics;    stars;    mass loss;    winds;    outflows;   

DOI  :  10.1515/astro-2017-0362

来源: Institute of Theoretical Physics and Astronomy

【 摘 要 】

Detached, symbiotic binaries are generally assumed to interact via Bondi-Hoyle-Littleton (BHL) wind accretion. However, the accretion rates and outflow geometries that result from this mass-transfer mechanism cannot adequately explain the observations of the nearest and best studied symbiotic binary, Mira, or the formation of some post-AGB binaries, e.g. barium stars. We propose a new mass-transfer mode for Mira-type binaries, which we call ‘wind Roche-lobe overflow’ (WRLOF), and which we demonstrate with 3D hydrodynamic simulations. Importantly, we show that the circumstellar outflows which result from WRLOF tend to be highly aspherical and strongly focused towards the binary orbital plane. Furthermore, the subsequent mass-transfer rates are at least an order of magnitude greater than the analogous BHL values. We discuss the implications of these results for the shaping of bipolar (proto)-planetary nebulae and other related systems.

【 授权许可】

Unknown