[vsnet-chat 2165] Re: B-V estimates of Nova Aql 1999

[aah@nofs.navy.mil]

Kato-san wrote:
>  While compiling observations, I noticed severe discrepancies in reported
>B-V values of Nova Aql 1999.  The Czech data reported in IAUC 7228 indicate
>B-V of +0.3 to +0.4 while Moscow observations (reported to vsnet-obs)
>indicate B-V of +1.2 to +1.3 on the same date.  Considering the strong
>interstellar lines and the location near the molecular cloud, I suspect
>the redder estimate can be more realistic.
  I agree -- the redder values are correct.  Here is my photometry
of V1493 Aql:

yymmdd    HJD         V     B-V    V-R    R-I
990717  51376.7473  10.964  1.222  1.668  0.428 
                     0.005  0.005  0.026  0.051

990720  51379.8288  11.569  1.254  1.869  0.409
                     0.003  0.010  0.013  0.083
            
990721  51380.8223  11.712  1.243  1.848  0.350
                     0.004  0.005  0.022  0.040

(the red errors are large because I was using short exposures
to calibrate the 8.4mag Tycho star).

You can see that my measures agree with the Moscow observations.
Arne

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