Bifurcation points in close binary evolution: Medium-mass binaries |
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Authors: | J P De Grève |
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Institution: | (1) Astrophysical Institute, Vrije Universiteit Brussel, Belgium |
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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
to 9M
. 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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Keywords: | |
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