[vsnet-chat 7408] Re: CT Lac

[Taichi Kato]

> I've noticed that observations of CT Lac are being included
> in vsnet-recent-rcb lists.  Is their any evidence to suggest that
> CT Lac is an RCB star?  GCVS give type SRA with a very large
> amplitude of 10.6-17.2p for an SR star.  Spectrum suggests
> a carbon star, but RCB?

   I'm not sure about the origin of the classification, but it
must have been somehow introduced in the early 1990's (VSOLJ observations
started) from certain literature, but I may be wrong.

   Given the very large amplitude (even in p), the object might have
undergone some sort of dust fading in the past.  The two GCVS references
may provide more information:

06566. A.K.Alksnis, Z.K.Alksne, I.A.Daube, Photometric Studies on Red Stars (in russian), p.7-114, Riga, 1973.

04972. A.Alksnis, MVS 9, H.2, 25, 1981.

   But the MVS article didn't show that large amplitude.  The GCVS team
might know ...?