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60 AUTOSTAR CCD PHOTOMETRY

Terms and Definitions

It is very important to define terms and keep them straight. The

following is a list of definitions used in the equations for extinction

determination.

Measured Data (Standard Star)

I Star Counts V Star Counts

R Star Counts B Star Counts

Calculated Data (Corrected for 1.0 second integration time)

I Star Counts Corrected V Star Counts Corrected

R Star Counts Corrected B Star Counts Corrected

Equations

Magnitudes are first calculated on the instrumental scale, then

converted to the natural system, and finally transformed to

magnitudes on the standard system.

Instrumental Magnitude Calculations

= –2.5 * log

(I Star Counts) v

= –2.5 * log

(V Star Counts)

= –2.5 * log

(R Star Counts) b = –2.5 * log

(B Star Counts)

Where:

= Instrumental I Magnitude v = Instrumental V Magnitude

= instrumental R Magnitude b = Instrumental B Magnitude

The I, R, V, and B Star Counts are normalized to counts per

second. The basic equations for removing the atmospheric effects

on the data are:

= i – k'

* X

= v – k'

* X

= r – k'

* X

= b – k'

* X

=k'

– k'

=k'

– k'

=k'

– k'

=k'

– k'

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