[Aavso-photometry] Comps for VZ Sgr

[arne]

Jim Roe wrote:
> I've taken some images of VZ Sgr in V and Ic but I can't find comps.  I 
> notice that some folks are reporting I in the "recent observations" 
> file.  Where are you getting the comps?
> 
For the life of me, I cannot see where anyone answered you.  I looked
at the light curve in early September, due to Peter Williams indicating
that this RCrB star had gone into a fade (data taken on 28 Aug during
the total eclipse - a real Target of Opportunity!).  VZ Sgr dropped
to about V=12.5, and is now sitting there, waiting to recover.  Previous
dust events, such as the ones that occurred about 6 and 10 years ago,
went down as faint at V=14.5, so if this one doesn't fade any more,
it will be one of the shallower events in this star's history.

The BVRI data primarily comes from Giorgio Di Scala in Australia.
There exists a UBV sequence for VZ Sgr from D. Kilkenny, in the
1983 Publications of the Variable Star Section of the RASNZ,
volume 11, page 29, that was used in preparing our preliminary charts.
I'll see if there is another source for Rc/Ic.
Arne