[Aavso-photometry] AE Aqr

[Tomas L. Gomez]

On the night Aug 31/Sep 1, I made a 4 hour time series observation of
AE Aqr, with B filter (as well as V filter, to be able to transform to
the standard system). I will send the observations as soon as I reduce
them.

Tonight (Sep 2/3) I am planning to do another times, but I have a question:
To get the data transformed to the standard system, I use the usual formula:

B = b + T (b-v)

where b and v are the instrumental magnitudes, and T is the transformation
coefficient. Therefore, I need to get data also with the V filter, but
then I will loose time resolution. I guess that the standard way to do
this is  to take
frames following the sequence

B V B V B .....

and then calcultate the b-v color index for each B-frame by interpolation.
To get better time resolution,  last night I took the frames using the following
sequence:  

V B B B V B B B V B B B  ...

i.e., I took one picture with V for every three pictures with B. Then
I calculate the
color index b-v for each B-frame by interpolation. Is this OK?, or is it better
to use the sequence B V B V B .... to get a more precise interpolation of 
the color index?.  Or is it better to take frames only with the B filter, and 
report the instrumental b magnitude?

The aperture of my telescope is only 20 cm, so to get a good SNR I need to give
exposures of 20 min for B and 10 min for V.

-Tomas L. Gomez (GOT)
  Madrid, Spain