[vsnet-id 279] Re: Re: CU Vul and CS4490

[Brian Skiff <bas@lowell.edu>]

     Hoffmeister's chart is on MVS 266, and I have re-verified Timo's
identification of CU Vul.  Note that there is JHK and other photometry
for CU Vul by Noguchi et al. (1981 PASJ 33,373).  They give J=4.86 and
K=2.94 for C* 2798 (first Stephenson catalogue number), which they
explicitly link to CU Vul.  These are about five magnitudes brighter
than the 2MASS object Kato-san found nearby.
     Scanning the Noguchi et al. list quickly suggests cool carbon stars
such as V Hya, T Lyr, V Aql, etc. have J-K colors of 1.5 to 2.  Giants
near K5/M0 have J-K near 1.0, and of course stars near A0 have colors near
zero.  Thus for the latter ordinary stars, J-K is roughly the same scale 
as V-R in the visible.

\Brian

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