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30 AUTOSTAR CCD PHOTOMETRY

Extinction Coefficients

(Not needed for differential photometry)

for (v – i) k'

for v

for (v – r) k'

for (b – v)

for (r – i)

Zero Points

(Not needed for differential photometry)

for (V – I) ζ

for V

for (R – I) ζ

for (B – V)

Note: While Extinction and Zero Points are not needed for

differential photometry, they are needed to determine the color

transformation coefficients.

The equations for CCD Differential Photometry then simplify to

the following:

(R – I) = γ * (r – i) V = v + ε * (B – V)

(V – I) = α * (v – i) (B – V) = μ * (b – v)

(V – R) = β * (v – r)

Once the color transformation coefficients have been determined,

they can be used along with the raw magnitudes to produce

corrected magnitudes.

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