Table 3
P-values for the different coefficients used in Eq. (5) for the correction of stellar activity induced by an equatorial 1% spot on the simulated Sun.
| Parameter | N mean RV | SN mean RV | SN median RV |
|---|---|---|---|
| β0 | 0.0049 | 0.012 | 0.014 |
| β1 | 0.0021 | 0.0011 | 0.0011 |
| β2 | 2.22e − 16 | 2.22e − 16 | 2.22e − 16 |
| β3 | 0.92 | 0.76 | 0.76 |
| β4 | 0.34 | 0.41 | 0.41 |
| R2 | 0.7553 | 0.7283 | 0.7799 |
Notes. All the parameters corresponding to the Normal or SN parameters are statistically significant to explain the spurious RV variations caused by this spot, except for the width of the CCF and the variable that evaluates the interaction between the width and asymmetry of the CCF. The proposed correction is not able to perform as well as for the facula, and R2 values for the linear combination are smaller than 0.8.
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