[vsnet-chat 2980] Re:EsB365 observations and request

["A.E. Rosenbush" <mijush@mao.kiev.ua>]

Dear Dr.Kato, 
the origin of the R CrB type stars is not clear up to the end. 
The cases of DY Per, SV Sge, Z Umi, etc will change a view on this
matter. 
The dimming is the widespread phenomenon, some of novae at the transition, 
for example.
Therefore any observations are necessary ti decide this problem.  
Regards, 
Alexander Rosenbush

Dr.Kato wrote: 
>    DY Per is probably a problematic case.  This star, usually considered
>as an R CrB star, is a cool carbon stat having B-V=2.55 at V=12.60 (Henden).
>Hotter R CrB stars also exist, such as MV Sgr, another relatively overlooked
>object.

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