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Table 1.
Fitting coefficients (a and b) of the surface brightness, Sλ, in the Johnson B and V and Gaia G bands for RGB stars.
| Band | Color | Color range | a | b | rms (1σ, mag) |
|---|---|---|---|---|---|
| B | (B − J)0 | [1.8:3.4] | 1.284 ± 0.017 | 3.198 ± 0.047 | 0.087 |
| B | (B − H)0 | [2.2:3.9] | 1.176 ± 0.014 | 2.905 ± 0.046 | 0.079 |
| B | (B − Ks)0 | [2.3:4.0] | 1.130 ± 0.013 | 2.941 ± 0.043 | 0.076 |
| V | (V − J)0 | [1.1:2.1] | 1.591 ± 0.031 | 2.971 ± 0.052 | 0.085 |
| V | (V − H)0 | [1.5:2.6] | 1.322 ± 0.024 | 2.765 ± 0.052 | 0.078 |
| V | (V − Ks)0 | [1.6:2.7] | 1.230 ± 0.021 | 2.845 ± 0.048 | 0.075 |
| G | (G − J)0 | [1.0:1.7] | 1.895 ± 0.045 | 2.665 ± 0.065 | 0.083 |
| G | (G − H)0 | [1.4:2.2] | 1.434 ± 0.031 | 2.620 ± 0.061 | 0.078 |
| G | (G − Ks)0 | [1.5:2.3] | 1.301 ± 0.027 | 2.752 ± 0.056 | 0.075 |
Notes. The linear form of the fit is expressed as: y = ax + b. y represents the surface brightness in various bands and x represents the different colors.
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