Table 1
Estimating the possible impact of modulations on BW distances using RV data from different epochs.
| S / N | N 1 | N 2 | Δt | BJD1 | BJD2 | ΔAvr | ΔR1/p | ΔR2/p | err(d) | ||
| Cepheid | HD | [yr] | [d] | [d] | [km s-1] | [R⊙] | [R⊙] | [%] | |||
|
|
|||||||||||
| QZ Nor | 144972 | 29 | 18 | 16 | 2.1 | 5660.3 | 6430.3 | −1.26 ± 0.05 | 1.10 ± 0.01 | 1.26 ± 0.01 | −14.5 ± 0.6 |
| V335 Pup | 65227 | 36 | 11 | 30 | 2.8 | 5659.6 | 6660.8 | 1.12 ± 0.01 | 1.06 ± 0.01 | 0.95 ± 0.01 | 10.3 ± 0.2 |
| l Car | 84810 | 257 | 110 | 151 | c2c | 6660.7 | 6701.7 | −0.51 ± 0.06 | 22.42 ± 0.01 | 23.62 ± 0.01 | −5.1 ± 0.1 |
| 263 | 37 | 86 | 1.7 | 6089.5 | 6659.7 | 1.35 ± 0.31 | 23.95 ± 0.02 | 22.42 ± 0.01 | 6.8 ± 0.1 | ||
| RS Pup | 68860 | 133 | 124 | 170 | c2c | 6660.8 | 6703.6 | 1.32 ± 0.11 | 35.38 ± 0.01 | 33.93 ± 0.01 | 4.3 ± 0.1 |
| 125 | 29 | 131 | 1.1 | 6327.6 | 6661.6 | −3.03 ± 0.08 | 32.79 ± 0.12 | 35.42 ± 0.01 | −7.4 ± 0.4 | ||
Notes. The columns list: median signal-to-noise ratio (S/N) of the spectra at 5700 Å; number of observations per epoch (N1,2); baseline (Δt) between the epochs considered (c2c indicates two consecutive pulsation cycles); median Barycentric Julian dates, less 2 450 000 (BJD1,2). ΔAvr is the change in peak-to-peak RV amplitude due to modulation. Columns ΔR1,2/p list the per-epoch RV curve integrals, cf. Eq. (2). The last column (err(d)) quantifies the systematic uncertainty on BW distances due to modulation if non-contemporaneous ΔR and ΔΘ are used to determine the distance, cf. Eq. (3).
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