[vsnet-chat 2330] Re: GSC1.2 magnitudes near V844 Her

[Lew Cook <lcoo@yahoo.com>]

It is worthwhile to keep in mind that V and visual
(v)magnitudes are slightly different. There are
numerous arguments about what is the proper color
correction to use for the B-V term, but if one
arbitrarily adopts a value of 0.2(B-V) color
correction factor, the magnitudes are as shown below
in a column I added in Arne's note.

Regards, Lew
http://vsnet.geocities.com/lcoo/ 

--- aah@nofs.navy.mil wrote:
> Hazel McGee correctly pointed out to me that my
> revised magnitude for GSC 3602-00173 almost exactly
> matches the magnitude for this star as reported
> in the GSC catalog, and therefore her estimate
> for the outburst did not have to be revised.
> I've checked additional stars in the field, with
> the following results:
                               Lew's added v column 
>    GSC       mag     V      v=V+0.2(B-V)
> 3062-00050  14.09  14.08        14.21 
> 3062-00281  12.80  12.83        13.03
> 3062-00347  13.59  13.61        13.81 
> 3062-00173  12.30  12.31        12.44
> 3062-02129  13.53  13.49        13.63
> 3062-00607  12.50  12.51        12.73
> 
> So, remarkably, for this specific field, GSC1.2
> magnitudes
> closely follow V-band magnitudes.  This is highly
> unusual!
> Arne
> 

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