[vsnet-chat 5409] Re: CGCS 2792

[DWest61506@aol.com]

In a message dated 7/20/2002 2:00:41 AM Central Standard Time, Brian.Skiff@lowell.edu writes:

    < 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:
Please explain your comments more fully - I am confused.  I know the original Johnson paper doesn't cover B-V >2, but Landolt has a few stars with B-V >2.  Why could you only measure the star with a single fixed instrument?
Thanks,
Doug West

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