Physics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004csqn.conf...88l&link_type=abstract
COMPACT STARS The Quest for New States of Dense Matter. Proceedings of the KIAS-APCTP International Symposium on Astro-Hadron Ph
Physics
Scientific paper
We have shown that if the Fe core in a presupernova star is to be sufficiently massive to collapse into a black hole, earlier in the evolution of the star the He core must be covered (clothed) by a hydrogen envelope during He core burning and removed only following this, in, e.g. common envelope evolution. This is classified as Case C mass transfer. These previous arguments were based chiefly on stellar evolution, especially depending on the way in which 12C burned. In this work we argue for Case C mass transfer on the basis of binary evolution. This has the consequence that the final separation af following common envelope evolution will depend nearly linearly on the mass of the companion md which becomes the donor after the He core of the giant has collapsed into the black hole. We show that the reconstructed preexplosion separations of the black hole binaries are consistent with our evolution scenario.
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