Monthly report for December 2002 by Christian A. Hummel:

Hummel re-analyzed NPOI test data taken in October with special LEDs
to investigate detector non-linearities. This time, the focus was on
fitting the exponential count rate decay at a number of intensity
levels. He prepared a web page on the results.

Hummel studied more systematically the stability and location of
the fringe peaks in the fringe frequency spectrum for various 
observations performed recently. He concluded that calibration
problems are related to the quality of the fringe spectrum
throughout the night. Results were posted on the NPOI web site.

Hummel added bias corrections of triple amplitude data to the
standard NPOI data reduction software OYSTER. Recent observations
of Be-stars in H-alpha light at low photon count rates revealed
the necessity of such a correction.

Hummel traveled to Flagstaff to instruct Dr. Ohishi, a visitor from
the Japanese MIRA optical interferometer, in the use of OYSTER. He also
consulted with Hutter and Benson on various issues.