Calibration Access and Data Handbook

Input

filter1

filter associated with the magnitude mag1. The filter identifier filter1 must be at a shorter wavelength as the filter defined by filter2

filter2

filter associated with the magnitude mag2. The value must be one of the three filters: 'U', 'B' 'V'.

mag1

zero point corrected magnitude derived from the deadtime corrected count rate measured in the passband filter1. This is the brightness which is used to calculate the colour (mag1-mag2) in the instrumental system (units: magnitude) .

mag2

zero point corrected magnitude derived from the deadtime corrected count rate measured in the passband filter2. This is the brightness which is transformed into the standard system (units: magnitude).

branch

optional integer parameter, used to select a colour transformation of a required branch in the Hertzsprung Russel diagram (equivalent to stars with different metallicities). The default value (=0) selects the transformation for main sequence stars.