[vsnet-chat 47] Re: supernova progenitor candidates

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Yamaoka Hitoshi wrote:

> I guess that the best candidate among the brightest (m_v < 2.5) stars 
> is Betelgeuse, but the time of the explosion event is not certain: it
> can be today, but it can also be after about a million years. 

     Encouraged to hear this!  This star then well deserves observer's
nightly visit -- as well as other SRc variables.  If one can visit 1000
SRc variables, there may be a chance to catch a supernova explosion in
1000 years -- am I right?   I wonder what the progenitor of the Crab nebula
or Tycho's star would have been like -- was it a naked-eye star?

     How about LMC/SMC stars?  Is there any systematic monitoring program?
What target selection?  How about the Orion Nebula stars?

> From the table of the binaries in _Chronological Scientific Tables
> (Rika Nenpyo, Japan)_, 32 Cyg A is K1I supergiant and has 23 solar
> mass. It should be doubtless to say that it will go supernova next
> one million years. 

     Thank you!  I will add this star to my visual monitoring program <g>.
Hoping the exposion is detected before the binary is engulfed by the blast.

Regards,
Taichi Kato

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