[vsnet-chat 54] Re: Supernova Type 1 candidates / progenitors

[kaz@optik.mtk.nao.ac.jp]

Berto Monard wrote：
>Hi chatters,
>
>It looks that Kaz Sekiguchi has ruined some of the fun. As a pro
>he is certainly qualified to forward his statement but...surely, most
>overweight WDs will go bang at their time! Where else are the
>progenitors of the supernovae Type 1 then, iow how do WDs
>increase their mass if not in close binaries? 
>
>Regards,
>
>Berto Monard
>

------------------------------------------------------------------Hi chatters,

No, not so fast concluding the fate of a massive WD in the CVs.
As Taichi Kato pointed out, we do not know how the core-collapse might occur.
For example, Type Ib/Ic supernovae are core-collapse supernovae of massive 
stars.

A most recent summary of this subject was given by J.C. Wheeler (Chapter 15
of the proceedings of " Evolutionary Processes in Binary Stars" p307-326. 1996,
Kluwer Academic Publ.).
However, my bet is that the U Sco subclass RNe are most likely to have
the O+Ne+Mg WD which is increasing mass to reach the Chandrasekar limit
(Livio, M. and Truran, J.W., 1992, Ap. J., 389, 695). Such a system may cause
accretion-induced collapse by electron capture on 24 Mg and 20 Ne 
(Nomoto, K. and Kondo, Y., 1991, Ap. J., 367, L19). 
Of course, there is a good chance this picture is completely wrong and it 
becomes a SN !

Then, where is the Type Ia SN progenitors ?  I just point out that 
Munari and Senzini (1992, Ap. J., 397, L87) suggested Symbiotic
binaries are also possible candidates.

In any case, this is a very interesting question.

Cheers,

-Kaz Sekiguchi




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