Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226...95e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, May 1, 1987, p. 95-110.
Astronomy and Astrophysics
Astronomy
6
Binary Stars, Hydrodynamic Equations, M Stars, Magnetohydrodynamic Stability, Stellar Models, Black Body Radiation, Roche Limit, Spatial Distribution, Stellar Structure
Scientific paper
The secondary star of a semi-detached binary system is investigated about the inner Lagrangian point using one- and two-dimensional hydrodynamic numerical techniques. The outburst behaviour of one-dimensional models on the line-of-centres, generated by the recombination energy available in the H/He I ionization zone, confirms previous work and is found to be sensitive to variations in the outer pressure boundary condition. Off this axis, a set of isolated one-dimensional geometrically adjusted spherical models are used to represent the Roche geometry of the star in the orbital plane. The unstable patch found on the stellar surface is of three scale heights in radius and produces mass bursts similar to those required for dwarf novae eruptions. The outburst behaviour is delayed and weakened on azimuthal displacement from the symmetry axis. These properties are shown to be strongly determined by the binary gravitational potential. The interaction between the above isolated off-axis models is then approximated.
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