Coronal mass transfer in interbinary loops

Details Coronal mass transfer in interbinary loops Coronal mass transfer in interbinary loops

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...433.1055f&link_type=abstract

Astronomy and Astrophysics, Volume 433, Issue 3, April III 2005, pp.1055-1061

Astronomy and Astrophysics

Astrophysics

3

Stars: Activity, Stars: Magnetic Fields, Stars: Binaries: Close, Stars: Coronae, Hydrodynamics

Scientific paper

We consider the transfer of coronal mass between
the members of a detached binary system along interconnecting
rigid magnetic loops. We show that the asymmetry in the gravitational potential drives a flow from the star closer to fill its Roche lobe towards the other star. The loop base pressures, flow velocities and mass fluxes are not
externally imposed but are a result of the heating rate along the loop.
As the loop heating increases, the base pressures and mass transfer rates increase and the Mach number decreases.
If the heating is not uniformly distributed along the loop, but is instead concentrated near one of the stars, then the mass transfer rate either increases or it decreases, and even changes direction, depending
on which star the heating is concentrated on. We also discuss the effect of choosing different boundary conditions. Our model predicts mass transfer rates in reasonable agreement with existing observational estimates, but fails to explain the
presence of chromospheric material detected between the stars. Additionally, the differential emission measure profile of the loop models is calculated and it is found to be higher in the loop leg close to the secondary star.

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