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Date: Thu, 7 Aug 2003 19:42:18 -0700 (MST)
From: Brian Skiff <Brian.Skiff@lowell.edu>
Subject: [vsnet-chat 6763] Re: (fwd) Re: Johnson V estimation from r'_CMT and 2MASS J-Ks
John Greaves wrote:
>> the very small distance between
>> r'_CMT and Rc is the problem, as the scatter is relatively immense.
This "shouldn't be", except perhaps for stars of extreme color.
I wonder whether the Carlsberg folks are in fact adjusting to Sloan r'
by adopting 'AB'-type magnitudes, whereby some flux value is zero across
the spectrum rather than having the zero-point shift in order to keep
unreddened A0V stars at color zero ('Vega' magnitudes). If CMT goes that
route, then it'll be a mess trying to transform those to ordinary
broadband magnitudes.
\Brian
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