Angular Momentum Transport during Direct Impact Mass Transfer

Details Angular Momentum Transport during Direct Impact Mass Transfer Angular Momentum Transport during Direct Impact Mass Transfer

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710504s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #105.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We investigate the transfer of angular momentum between the components of an interacting binary system where mass in transferred via Roche lobe overflow resulting in direct impact onto the surface of the accretor. We model the stars as spherically symmetric rigid spheres and assume the mass transfer stream follows the trajectory of a ballistic point mass ejected from the inner Lagrangian point of the donor star. We approximate the mass transfer stream by discrete, non-interacting ballistic particles, conserving the linear and angular momentum of the three-body problem during ejection, accretion, and transport. We find that, contrary to popular assumptions, direct impact accretion can actually facilitate the transfer of angular momentum from the spin of the donor star to the binary orbit. Thus, by increasing the orbital angular momentum of the binary, direct impact mass transfer may increase the stability of such systems, significantly affecting the expected evolution timescales. We show the exchange of orbital angular momentum between the components of a binary system undergoing this process for a wide range of system parameters.

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