[vsnet-chat 78] Re: SRc variables as supernova progenitors

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

Dear Ishida-san and chatters,

> >     It's a surprise to know SRc variables in the Galaxy are so rare.
> > May I have some more questions regarding this?
> 
> I actually didn't know it's rare or not when I wrote this sentences.  
> But, after receiving Kato-san's mail, I tried to make a quick 
> inspection on this point from the electronic GCVS4 data in Selected 
> Astronomical Catalogs, volume 1 (CD-ROM distributed by ADC, NASA).  

(omitted)

> Inspecting above results,  SRc variables seems to be actually rare.  

    I suspect the number of SRc variables may have been underestimated
because definite classification probably (I believe) needs spectroscopic
confirmation.  Many SRb or SRa stars may have been classified based on
light curves only, without information on luminosity classes.  I suspect
many "missed" SRc stars may be found in SR stars without subclasses,
or even in SRa or SRb stars without proper spectroscopic information.

    By obtaining number function vs. magnitude, we may know the completeness
of this catalog.  Since there are already at least two SRc variables
(alpha Ori and alpha Sco) among first-magnitude stars, there may be a chance
of a hundered SRc variables with visual magnitudes brighter than 6.

    Thank you for your information on pulsational properties of massive
red (super)giants.

Regards,
Taichi Kato

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp