Applications for photometric calibration

CURSA contains three applications for photometric calibration:

catphotomfit

define the transformation coefficients from the standard stars,

catphotomtrn

apply the transformation coefficients to determine the calibrated magnitudes for the programme objects,

catphotomlst

list the contents of a transformation coefficients file.

The usual sequence of using these applications is:

1. run catphotomfit to determine the transformation coefficients. Examine the residuals, exclude aberrant standard stars and re-run. Repeat this process until you get a satisfactory fit,

2. run catphotomtrn to apply the transformation coefficients to the programme objects and determine calibrated magnitudes for them.

The transformation coefficients are passed from catphotomfit to catphotomtrn via a file, the so-called `transformation coefficients file'. Normally you do not need to inspect this file. However, if you wish to do so then catphotomlst is available for this purpose.

The details of running the individual applications are described below.