[vsnet-chat 2993] Re: R CrB stars

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

I think this we have to do with the variability spread 
among definite class of objects: high mass loss rate; 
                                 enough high hydrogen (not very deficient! 
				           FG Sge, V854 Cen, V CrA); 
			         rich carbon. 
They are evolved stars. 
And this is no the single population (for example, Trimble V., Kundu A., 
PASP, 109, 1089, 1998). 
Alexander Rosenbush 


			      

Dr.Kato wrote: 
>   Whether it will be adequate or not to call sudden fadings caused by
>dust formation as the R CrB type variablity, this process has been widely
>observed in different sort of objects (R CrB stars themselves, carbon stars,
>RVB minimum (possible), DQ Her-type novae etc.).

>   However, the population of R CrB stars definitely exists, sharing some
>common characterstics (see Clayton's review).  It is not clear whether
>this class of variable represents a single or multiple classes of objects
>(e.g. in evolution), or whether the class has a definite borderline between
>R CrB stars and other variable stars.

VSNET Home Page

Return to Daisaku Nogami

---

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