[Aavso-photometry] Photometry with an Optec SSP-3

[Larry Gorski]

Arne:

Thanks very much for information on the comparison stars.  I really 
appreciate that.

Larry

----- Original Message ----- 
From: "arne" <arne at aavso.org>
To: "Larry Gorski" <actuary at mchsi.com>
Cc: <Aavso-photometry at mira.aavso.org>; "Schlaf, Eric" 
<eschlaf at icc.illinois.gov>
Sent: Tuesday, September 04, 2007 3:36 PM
Subject: Re: [Aavso-photometry] Photometry with an Optec SSP-3


> Larry Gorski wrote:
>> Hello:
>>
>> While I've observed variable stars for several years most of 
>> observational work has been visual and many years ago.  Years ago I 
>> purchased an Optec SSP-3  (Generation 1) photometer but I haven't used it 
>> for years until I recently tbrushed off the cobwebs.  One star that I 
>> used to monitor photometrically was R Sct so my inclination was to start 
>> with R Sct again.  My setup at home is simple.  Optec SSP-3 (Generation 
>> 1) at the back end of C-8 (circa 1980).  In order to improve the quality 
>> of my efforts, I searched the AAVSO PEP Charts for a R Sct "P" chart . 
>> There wasn't any.  My question is "Which star, if any, is the star that 
>> is typically used as a comparison star and a check star?"
>>
>> Thanks for your input.
>>
> R Sct is not on the PEP "program", which is why there is no PEP chart.
> This RV Tau variable ranges from V=4.5 at maximum (pretty consistent)
> to V=8.5 at minimum (but with minima from 6th to 8.5, not very
> consistent).  Matt Templeton has looked at its variation; Janet was
> a coauthor on an R Sct paper; Al Gilmore and Pam Kilmartin, southern
> members/observers at Mt. John worked on R Sct with Karen Pollard for 
> years.
>
> The normal comparison stars for R Sct are
> ID    SAO#     RA (1950) DEC     V   (B-V) (V-Rc) (V-Ic)
> comp  142661  18:47:00  -05:58  5.99  1.60  0.83  1.55
> check 142598  18:43:21  -06:18  7.92  1.26  0.65  1.30
>
> (from Pollard et al., 1996, MNRAS 279, 949)
>
> Note that these are 1950 coordinates.
> Arne
>