Open Access
Table C.2
Additional FITS header keys when a Fourier series model was fitted to VELOCE data
| Optional Header Fit - Added to PrimaryHDU | |
|---|---|
| KEY | DESCRIPTION |
| P | Pulsation Period Ppuls [d] |
| P_ERR_SYST | Systematic uncertainty on Ppuls related to the choice of the number of harmonics (NFS) [d] |
| P_ERR_STAT | Statistical uncertainty on Ppuls determined via Monte-Carlo (fixed number of harmonics Nfs) [d] |
| P_ERR | Total uncertainty on the pulsation period Ppuls (combination of P_ERR_SYST and P_ERR_STAT) [d] |
| E | Epoch (BJD – 2400000.0) at which ϕ = 0 (determined using Fourier fit) |
| E_ERR_SYST | Systematic uncertainty on E related to the choice of the number of harmonics (NFS) |
| E_ERR_STAT | Statistical uncertainty on E determined via Monte-Carlo (fixed number of harmonics NFS) |
| E_ERR | Total uncertainty on the epoch E (combination of E_ERR_SYST and E_ERR_STAT) |
| N_DOF | Degrees of freedom of the fit |
| CHISQ | Chi-squared statistics |
| NORMALIZED_CHISQ | Normalized chi-squared |
| STDDEV | Standard deviation of the residuals (weighted) [km s−1] |
| STDMER | Standard error of the mean of the residuals (STDDEV/sqrt(N_DOF)) [km s−1] |
| N_TERMS_FS | Number of harmonics (terms) used for the Fourier Series model (NFS in the text) |
| BOOL_POLYNOMIAL | Flag - True if a polynomial was used as a nuisance parameter for determining the best-fit Fourier Series model and the pulsation period |
| BOOL_KEPLERIAN | Flag - True if a Keplerian orbit was used to represent orbital motion, see Table C.3 for the best-fit parameters of the Keplerian model. |
| VGAMMA_0 | Systemic heliocentric velocity [km s−1] (When no polynomial is used for the fit, VGAMMA_0 is equal to the pulsation averaged RV which is determined by the constant term of the fit (υγin Eq. 2). In case a polynomial was also adopted for the fit, either no value is reported or we estimate the VGAMMA_0 from the fit that combined the Fourier series with a Keplerian or from the Keplerian fit over VELOCE and literature data (V+L).) |
| VGAMMA_0_ERR | Uncertainty on VGAMMA_0 [km s−1] |
| DELTA_RADIUS_OVER_P | Difference in the star’s radius between its most contracted and expanded configuration ΔR/p [R⊙] |
| INTERCEPT_PHASE | Phase at which the ascending branch cross the mean value of the Fourier series |
| PEAK2PEAK | Peak-to-peak amplitude (Ap2p) of the pulsation [km s−1] |
| MIN_RV | Minimum RV during the pulsation cycle [km s−1] |
| MIN_RV_PHASE | Phase of minimum RV |
| MAX_RV | Maximum RV during the pulsation cycle [km s−1] |
| MAX_RV_PHASE | Phase of maximum RV |
| Rn1 | Amplitude ratio between the n-th and the first harmonics (An/ A1) (up to n = 7) |
| Rn1_ERR | Uncertainty on the amplitude ratio between the n-th and the first harmonics |
| PHIn1 | Phase difference between the n-th and the first harmonics (PHIn - n PHI1) (up to n = 7) |
| PHIn1_ERR | Uncertainty on the phase difference between the n-th and the first harmonics |
| POLYDEG | Optional - Degree of the polynomial used to improve the fit the pulsation curve, if applied (key exists only if BOOL_POLYNOMIAL is True) |
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