Automation and Iteration Methods for Processing CCD Stellar Photometry in the Strömvil System

Details Automation and Iteration Methods for Processing CCD Stellar Photometry in the Strömvil System Automation and Iteration Methods for Processing CCD Stellar Photometry in the Strömvil System

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20515302b&link_type=abstract

American Astronomical Society Meeting 205, #153.02; Bulletin of the American Astronomical Society, Vol. 36, p.1602

Astronomy and Astrophysics

Astronomy

Scientific paper

We have been making CCD observations on stellar fields with use of the Strömvil and Vilnius Photometric Systems at VATT, Mt. Graham; Casleo; USNO-Flagstaff, and Loiano, Italy. From quality photometry of one to two percent accuracy the classification of all the types of stars can be made. We will present our application of the CommandLog (Janusz and Boyle, 2003, The Journal of Astronomical Data, 9, 4) and then show methods for iterating the processing by use of the SIMPLEX algorithm. The CommandLog is an HTML document that provides the photometry cookbook steps to be pasted into the IRAF command line. SIMPLEX code incorporated into our IRAF task allows quick reprocessing of the data to minimalize the errors of the flatfield or tune IRAF photometric parameters in order to obtain the optimum stellar photometry both in the instrumental and transformed standard systems.
In July 2004, a Strömvil workshop was held at Castel Gandolfo, Italy. Philip was able to work with the creator of the CommandLog, Janusz, on some CCD data obtained at CASLEO with Olga Pintado. Using SIMPLEX it was possible to investigate many different variations of the input parameters to use in reducing the data. Without SIMPLEX this process would have taken many days of work but we were able to do a set of variations in a few hours.

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