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AUTOSTAR CCD PHOTOMETRY 79

Determining γ and ζ

A plot of ((R – I) – (r – i)

) versus (R – I) has the slope (1 – 1 / γ)

and intercept ζ

/ γ, from which the values for γ and ζ

can be

calculated. The slope (1 – 1 / γ) has a value near zero and can be

determined more accurately than the simple slope γ.

Table E-9 lists the data and Figure E-5 shows a plot of the data.

The equations are in the form of an equation for a straight line:

((R – I) – (r – i)

) = (1 – 1 / γ) * (R – I) + ζ

/ γ.

Table E-9. ((R - I) - (r - i)

) versus (R - I) Data.

(R–I) – (r – i)

(R – I)

0.5698 –0.0280

0.5449 0.6440

0.5969 0.4380

0.6070 0.2780

0.6103 0.3280

0.6377 0.2920

0.5424 0.3250

0.5556 0.4990

Figure E-5. ((R–I) – (r–i)

) versus (R–I) Plot.

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