[vsnet-chat 7406] Re: CT Lac

[arne]

Gary Poyner wrote:
> 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?
> 
The AAVSO light curve certainly looks LPV-like to me.  It also
gives an amplitude range of 9.5-13 or so, with a regular period
near the GCVS value of 555 days.  I'd call it a Mira,
personally, though the spectrum says carbon star.  The GCVS
amplitude is photographic, which is always larger than the
visual amplitude.  Nice light curve, BTW - someone who knows
what they are doing has been observing it.
Arne