[vsnet-chat 60] Re: Supernova Type 1 candidates / progenitors (Munari)

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

From munari@astras.pd.astro.it Thu Feb 13 00:38 JST 1997
Date: Wed, 12 Feb 1997 16:30:26 +0100
From: munari@astras.pd.astro.it (FAX +39 424 600023, TEL. 600033)
To: tkato@kusastro.kyoto-u.ac.jp
Subject: Re: [vsnet-chat 55] Re: Supernova Type 1 candidates / progenitors
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To the best of my knowledge, there are several SSXS (Super Soft X-ray Sources)
in the northern emisphere, not only that one mentioned by T.Kato.
One that could be be an excellent target for CCD-equipped amateurs is
Draco C-1, a symbiotic star in the Draco dwarf galaxy. It shines at
V=17 and I=15. The donor star to the accreting white dwarf is a
carbon bright giant, at the very tip of the AGB (to have a carbon
giant in a dwarf galaxy means that star formation was still active not much
long ago). Is the Carbon star in Draco C-1 pulsating ? If yes, the
mass transfert to the WD companion would be larger. And if yes, what is
the pulsating period ? The carbon stars in the Draco dwarfs seems unsually
blue, and this could trigger quite short pulsation periods (lass than 100 
days).

Regards
          Ulisse Munari
          Padova-Asiago Astronomical Observatories

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