Table 1.
Logbook of observations and results of magnetic field measurements for the Herbig Ae star HD 169142.
| Instr. | JD | Exposure | S/N | Line | FAP | Det. | ⟨B⟩z | Remarks | |
|---|---|---|---|---|---|---|---|---|---|
| (2 450 000+) | time (s) | mask | flag | (G) | |||||
| E | 3422.1630 | 2400 | 121 | Fe I, Si II | 1.6 × 10−4 | MD | −1310 | 118 | broad feature |
| E | 3424.1403 | 2400 | 97 | Fe I, Si II | ND | too noisy | |||
| E | 3512.9597 | 2400 | 144 | Fe I | 3.5 × 10−6 | DD | 123 | 17 | crossover-like |
| E | 3606.8105 | 2000 | 239 | Fe I | > 10−3 | ND | broad feature? | ||
| H | 9694.8707 | 4800 | 145 | Fe I | < 10−10 | DD | 19 | 8 | |
| H | 9697.7998 | 6400 | 140 | Fe I | 8.5 × 10−7 | DD | −42 | 15 | |
| H | 9697.7998 | 6400 | 145 | Cr II, Fe II | 6.3 × 10−4 | MD | −58 | 41 | broad feature |
| H | 9698.9001 | 4000 | 150 | Fe I | 2.8 × 10−7 | DD | −92 | 17 | |
| H | 9699.8618 | 4000 | 210 | Fe I | 3.8 × 10−7 | DD | −46 | 17 | possible blend? |
Notes. The first column gives the name of the spectropolarimeter used: E for ESPaDOnS and H for HARPSpol. The second column presents the Julian date at the middle of the exposure, while in the third and fourth columns we show the corresponding exposure times and the S/N measured in the Stokes I spectra in the spectral region around 4510 Å. The line mask used, the false alarm probability (FAP) values, the detection flag (DD means definite detection, MD marginal detection, and ND no detection), the measured LSD mean longitudinal magnetic field strength, and a remark on the Stokes V feature(s), are presented in Columns 5–9.
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