[vsnet-chat 5404] Re: CGCS 2792

[Brian Skiff <Brian.Skiff@lowell.edu>]

>> Although the reported magnitudes (9.1-10.0) are far from the V
>> maeasures (V= 8.36, B-V= 4.04....

     If the mv = V + 0.2(B-V) rule holds, then you would expect the star
to appear at mv ~9.2 when standard V was 8.4, so the much fainter visual
observations aren't surprising.

>> ...since the probbilities of this being variable are high.

     Is there any cool carbon star that has been observed to be _constant_?!

     Also, given that the V system is not defined redder than B-V > 2.0 or so,
remember that it will be impossible to do other than differential
photometry on the star, and only with a single, fixed instrument.  The
systematic errors from device to device will have to be adjusted out
after the fact.

\Brian

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