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Bifurcation points in close binary evolution: Medium-mass binaries
Authors:J P De Grève
Institution:(1) Astrophysical Institute, Vrije Universiteit Brussel, Belgium
Abstract:The remaining core hydrogen burning lifetime after case B of mass transfer of the secondary (mass gaining) component in a medium mass close binary star is estimated, for mediummass binaries with primaries in the mass range 5M odot to 9M odot. From the comparison of this quantity with the helium burning time-scale of the remnant primary a critical mass ratioq c is derived such that for larger values ofq, mass transfer from the secondary towards the primary starts before the latter has evolved into a white dwarf. Consequences for the advanced stages of medium mass binaries are discussed.
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