Table 2: Mean relation between the effective temperature and (B-V)0, (b-y)0, (B2-V1)0, as well as (g1-y)0 for A-type to mid F-type, luminosity class V to III objects. Only spectral types according to the Yerkes system (Keenan 1985) are listed.
Spec. $T_{\rm eff}$ (B-V)0 (b-y)0 (B2-V1)0 (g1-y)0
A0 10 000 -0.025 -0.015 -0.160 -0.010
A2 8750 +0.067 +0.031 -0.093 +0.025
A3 8300 +0.112 +0.055 -0.060 +0.042
A5 7900 +0.161 +0.082 -0.024 +0.062
A7 7500 +0.221 +0.120 +0.022 +0.087
F0 7050 +0.304 +0.185 +0.087 +0.125
F2 6750 +0.368 +0.238 +0.141 +0.155
F3 6650 +0.390 +0.254 +0.159 +0.165
F5 6450 +0.433 +0.284 +0.196 +0.184

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