[APML] red and blue tails on stars?

[Joe Pedit <pedit@email.unc.edu>]

I recently worked up an image of M45 on Fuji Provia 100F.  The image is
from a 90 minute exposure through an AP 130mm f/6 with field flattener
and Nikon N90s camera.  The slide was scanned with a Polaroid Sprintscan
4000.  The bright stars on the lower part of the frame have red and blue
tails going down.  See <http://www.unc.edu/~pedit/lower.jpg> for an
example.  Bright stars from the upper part of the frame have red and
blue tails going up.  Any thoughts on what is causing this would be
appreciated?

A 1/2 scale image (2000 x 1500, 687 kb) of the central part of the frame
is at <http://www.unc.edu/~pedit/m45-2000.jpg>.

Joe

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