Table 1
List of spectropolarimetric observed standard stars.
| Name | RA1 (J2000) |
Dec1 (J2000) |
N° of obs. | Pv2 (%) |
σrms(PV)3 (%) |
Band | P.D. (%) (catalogue) |
PA (deg.) (catalogue) |
References |
|---|---|---|---|---|---|---|---|---|---|
| Unpolarised standard stars | |||||||||
| HD 191195 | 20 06 13.9 | +53 09 56.5 | 10 | 0.03 | 0.02 | − | 0.004 ± 0.001 | (b) | |
| HD 21447 | 03 30 00.2 | +55 27 06.5 | 16 | 0.05 | 0.02 | V | 0.051 ± 0.020 | (a) | |
| HD 154892 | 17 07 41.3 | + 15 12 37.6 | 20 | 0.08 | 0.04 | B | 0.050 ± 0.030 | (c) | |
| HD 212311 | 22 21 58.6 | +56 31 52.7 | 10 | 0.11 | 0.03 | V | 0.034 ± 0.021 | (a) | |
| High polarisation standards | |||||||||
| HD 7927 | 01 20 04.9 | +58 13 53.8 | 3 | 3.25 | 0.08 | V | 3.298 ± 0.025 | 91.08 ± 0.20 | (a) |
| HD 25443 | 04 06 08.1 | +62 06 06.6 | 14 | 5.21 | 0.05 | V | 5.127 ± 0.061 | 134.23 ± 0.34 | (a) |
| HD 161056 | 17 43 47.0 | —07 04 46.6 | 27 | 4.05 | 0.04 | V | 4.030 ± 0.025 | 66.93 ± 0.18 | (a) |
| HD 19820 | 03 14 05.3 | +59 33 48.5 | 11 | 4.82 | 0.03 | V | 4.787 ± 0.028 | 114.93 ± 0.17 | (a) |
| BD +25 727 | 04 44 24.9 | +25 31 42.4 | 2 | 6.31 | − | V | 6.280 ± 0.003 | 32.20 ± 0.10 | (f) |
| BD +59 389 | 02 02 42.1 | +60 15 26.4 | 2 | 6.63 | − | V | 6.701 ± 0.015 | 98.09 ± 0.07 | (a) |
| HD 154445 | 17 05 32.3 | −00 53 31.4 | 3 | 3.72 | 0.06 | V | 3.780 ± 0.062 | 88.79 ± 0.47 | (a) |
| HD 155197 | 17 10 15.8 | −04 50 03.7 | 1 | 4.45 | − | V | 4.320 ± 0.023 | 102.84 ± 0.15 | (a) |
| Variable high polarisation standards | |||||||||
| HD 183143 | 19 27 26.6 | +18 17 45.2 | 7 | 6.13 | 0.15 | V | 6.100 ± 0.050 | 179.30 ± 0.20 | (d) |
| HD 204827 | 21 28 57.8 | +58 44 23.2 | 9 | 5.56 | 0.20 | V | 5.322 ± 0.014 | 58.73 ± 0.08 | (a) |
| V | 5.607 ± 0.003 | 58.33 ± 0.02 | (e) | ||||||
Notes. (a) Schmidt et al. (1992); (b) Piirola et al. (2020); (c) Turnshek et al. (1990); (d) Hsu & Breger (1982);(e) Piirola et al. (2021); (f) Nordic Optical Telescope4. 1The coordinates were taken from the SIMBAD Astronomical Database. 2The average degree of polarisation in the synthetic V band. 3The standard deviation calculated as in Eq. (8). 4Source: https://www.not.iac.es/instruments/turpol/std/bd25727_note.html
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