Table 5.
Best-fit photometric parameters for SAT uvby bands.
| Parameter | u | v | b | y |
|---|---|---|---|---|
| k | Fixed | Fixed | Fixed | 0.999 ± 0.020 |
| rA + rB | 0.180 ± 0.032 (b) | 0.182 ± 0.032 (b) | 0.181 ± 0.022 (b) | 0.180 ± 0.013 (b) |
| i (° ) | 85.6 ± 1.3 (b) | 85.5 ± 1.3 (b) | 85.58 ± 0.89 (b) | 85.61 ± 0.53 (b) |
| JB/JA | 1.003 ± 0.043 (b) | 1.006 ± 0.041 (b) | 1.009 ± 0.034 (b) | 1.004 ± 0.014 (b) |
| quad uA = uB(c) | 0.9 ± 1.8 (b) | 0.7 ± 1.7 (b) | 0.6 ± 1.2 (b) | 0.62 ± 0.64 (b) |
| quad νA = νB(c) | −0.1 ± 2.4 (b) | 0.26 ± 2.2 (b) | 0.3 ± 1.7 (b) | −0.01 ± 0.94 (b) |
| rA | 0.090 ± 0.016 (b) | 0.091 ± 0.016 (b) | 0.090 ± 0.011 (b) | 0.0898 ± 0.0067 (b) |
| rB | 0.090 ± 0.016 (b) | 0.091 ± 0.016 (b) | 0.090 ± 0.011 (b) | 0.0898 ± 0.0065 (b) |
| lB/lA | 1.001 ± 0.061 (b) | 1.004 ± 0.059 (b) | 1.007 ± 0.054 (b) | 1.002 ± 0.042 (a) |
| RMS (mmag) | 17.0 | 15.0 | 13.0 | 11.0 |
Notes. The ratio of fractional radii k for y data was constrained with an empirical spectroscopic light ratio (lB/lA = 1.004 ± 0.042). Consistency checks: Differences in photometric and spectroscopic light ratios: u(n/a), v(0.20σ), b(0.0σ), and y(0.03σ). We also note the decrease in RMS scatter consistent with nightly RMS scatter for SAT observations, which further justifies the use of y band data to constrain k. The two limb-darkening coefficients were freely varying for all four bands and associated uncertainties were found to be large producing unphysical results. The best-fit JB/JA values are all larger than unity for all four bands, and contradict the results using TESS data. A potential path of reconciliation is found by realising the existence of a strong parameter correlation between the limb-darkening and surface brightness ratio possibly throwing off the solutions. Considering y data we therefore carried out tests by investigating fixed and varying combinations of the limb-darkening parameters and found no differences.
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