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BC Cas

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MUY
MUY's picture
BC Cas

BC Cas had an nova-like outburst in 1929. But according to T. Zwitter et al in 'Cataclysmic Variables and Related Objects: Proceedings of the 158th Colloquium of the International Astronomical Union' p 94 table 2, it is not showing a CV-like spectrum. So what type could this variable be? 

Eddy

Sebastian Otero
Sebastian Otero's picture
Apparently a nova

Hi Eddy,

This paper by Liu and Hu confirms it spectroscopically as a CV and also quotes other studies that did the same.
The amplitude is small for a typical nova, maybe it is recurrent.

Best wishes,
Sebastian

 

ocn
ocn's picture
BC Cas

Hi Eddy

The amplitude in the Downes online cat is given as 10.7-17.4p. Based on just this one characteristic, more suggestive of a UGWZ than a classical nova -- but your quoted paper mentions a non-CV spectrum.

The DSS1, DSS2, and 2MASS images look quite unremarkable as well. Probably no big dusty red giant donor here either a la V745 Sco / V3890 Sgr type of RN.

Perhaps the star that has been identified with BC Cas is in error - maybe we're looking at a close visual companion instead of the real variable. 1929 was quite awhile ago - wonder what the plate scales and limiting magnitudes of the exposures in question were ...

As well ... in the AAVSO DB there are a handful of positives. The most recent one there (STR) seems consistant with Downes' identification. The 2 earlier ones by AAM are perhaps more interesting, or problematic.

I think I also have a positive detection of this one ( as yet unreported)  from a couple of years ago, in my image archive. It was either in V or Rc, and  around 17m as I remember. Must dig that one out !

What DOES the spectrum show, I wonder ?  If non-CV, then maybe EXOR ? Not symbiotic. Mis-identified ?

A Stellar Cold Case !    Thanks for bringing it up.

Steve  

ocn
ocn's picture
BC Cas

 

Sebastian,

Thanks for (clarifying)

Steve

 

MUY
MUY's picture
Thanks Sebastian and Steve

Thanks Sebastian and Steve for the info! I'll will add this one to my program. 

Eddy

 

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