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78 AUTOSTAR CCD PHOTOMETRY

Figure E-4. ((V – R) – (v – r)

o

) versus (V – R) Plot.

Slope = (1 – 1 / β)

(1 – 1 / β) = [Δ((V – R) – (v – r)

o

)) / Δ(V – R)]

Δ ((V – R) – (v – r)

o

)) / Δ (V – R) = –

0.1400/1.200

(1 – 1 / β) = –0.1167

β = 1 / (1 – (–0.1167))

β = 0.8955

β is (V – R) Color Coefficient

Y-Intercept when MX = 0 is ζ

vr

/ β

Y-Intercept = ζ

vr

/ β

ζ

vr

= β * Y-Intercept

ζ

vr

= 0.1375 * 0.8955

ζ

vr

= 0.1231

ζ

vr

is (V– R) Zero Point

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