AAS 205th Meeting, 9-13 January 2005
Session 153 Computation, Data Handling, Image Analysis
Poster, Thursday, January 13, 2005, 9:20am-4:00pm, Exhibit Hall

Previous   |   Session 153   |   Next

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

R. P. Boyle (Vatican Observatory), R. Janusz (U. College Ignatianum, Krakow), A. G. D. Philip (Union College and ISO), V. Laugalys (ITPA, Vilnius)

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.

If you would like more information about this abstract, please follow the link to http://vaticanobservatory.org. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: rboyle@as.arizona.edu

Previous   |   Session 153   |   Next

Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.