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Fig. 3

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Ranges of initial mass ratios and orbital periods of binaries for which the primary star is expected to explode as a type IIb of the extende type supernova. We assumed a primary mass M1 = 15 M, a metallicity Z = 0.02 and conservative mass transfer. We assume that type Ib supernovae result from stars with less than 0.1 M of hydrogen in their envelope at the time of explosion, type IIb supernovae from stars with 0.1–0.5 M of hydrogen and type II with more than 0.5 M of hydrogen. Furthermore we distinguish different cases based on the response of the companion star. Case 1: the secondary evolves to an O star at time of explosion of the primary. Case 2: the secondary evolves to a B supergiant. Case 3: the secondary evolves to a K supergiant. See also Fig. 4 for an enlargement.

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