... Extreme helium stars are highly evolved luminous stellar remnants. ... of nearly all EHes indicates that some remnant of the outermost hydrogen-rich layers ... a surface mixture which includes a remnant of the hydrogen envelope, predominantly ...
... As the evolved remnants of stars, the formation of close DDs requires their ... where NccSN is the number of stars going supernova in a calculation of a sample of ... stars in the localized HII region and the extragalactic supernova scaled calculation ...
... Convective overshooting is important for the remnant mass of a binary after RLOF ... Edelmann et al. 2003) and the ESO supernova Ia progenitor survey (Lisker et al. 2005 ...
... poor in hydrogen and are rich in carbon and nitrogen (remnants of evolved stars ... collapses violently on itself producing a supernova and eventually a neutron star ...
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Ссылки http://star.arm.ac.uk/~csj/nuffield/reports/emma_stephenson_report.doc -- 270.5 Кб -- 14.08.2008 Похожие документы
... Extreme helium stars are highly evolved lu- minous stellar remnants. ... nearly all EHes indicates that some remnant of the outermost hydrogen- rich layers ... a surface mixture which includes a remnant of the hydrogen envelope, predominantly ...
... PG1159s around the `knee' of the evolution tracks of lowmass stellar remnants contracting onto the whitedwarf sequence, whilst their surface abundances (n He ~0.7, n C ~0.3, Table 1) suggest substantial mixing between a remnant He envelope and C core ...
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Ссылки http://star.arm.ac.uk/~csj/papers/newsletter/ccp7n21_jeffery1.ps -- 137.5 Кб -- 30.10.2001 Похожие документы