Yearly accomplishments for the period of 1 April 2002 through 31 March 2003

by
Christian A. Hummel

The accomplishments include:

	1:	Presented a talk on "NPOI 6-station array data reduction"
		at the Michelson Summer School on Optical/IR
		Interferometry held in June at the CfA in Cambridge.
		As for last year's summer school, prepared and executed
		lab exercises with NPOI 6-station data on the triple
		star Eta Virginis.
	2:	Reduced and analysed all NPOI data on Eta Vir, determined
		the orbital elements, derived component masses using
		published radial velocity data, and wrote a paper with
		the NPOI team on "First observations with a co-phased 
		six-station optical long baseline array: application to the 
		triple star Eta Virginis". This paper was accepted by the 
		Astronomical Journal and will appear in the May 2003 issue.
	3:	Attended a meeting of the SPIE in Hawaii and presented
		together with J. Benson a talk on the 6-station observations
		with NPOI.
	4:	Supported the debugging of the 6-station system with
		in-depth raw data analysis including fringe frequency
		spectrum plots and the analysis of several engineering
		tests on detector non-linearity and cross talk.
	5:	Traveled to Santiago, Chile, for collaboration with
		former NPOI postdoc on the coherent integration of
		data on Gamma Sagittae.
	6:	Presented a talk at the IAU colloquium 191 in Merida,
		Mexico, on the analysis of the Eta Virginis system.

Here I list separately what I have done to maintain and improve the NPOI
data reduction software, comprising CONSTRICTOR and OYSTER (I have listed
only larger projects):

	1:	In CONSTRICTOR, the option for using unused fringe
		frequencies for bias correction was implemented.
		The logic of the system configuration file was changed
		to make observation preparations easier.
	2:	In OYSTER new procedures for photometry and triple
		amplitude bias corrections were added. Elliptical
		stellar disks were added to the available model
		components.
	3:	Updated the manual on OYSTER.