Table 12.
Measured and corrected polarization pc [%] and θc [°] of high-polarization standard stars and comparisons with literature values pℓ, θℓ.
| V | N_R | N_I | ||||
|---|---|---|---|---|---|---|
| pc, ℓ | θc, ℓ | pc, ℓ | θc, ℓ | pc, ℓ | θc, ℓ | |
| HD 79186, nobs = 1 | ||||||
| meas | 2.75 | 51.1 | 2.58 | 52.1 | 2.18 | 52.5 |
| lit [1] | 2.59 | 47.7 | 2.40 | 48.4 | (48.4) | |
| pc/pℓ, Δθc − ℓ | 1.06 | +3.4 | 1.07 | +3.7 | (+4.1) | |
| HD 98143, nobs = 2 | ||||||
| meas | 7.90 | 135.6 | 7.95 | 137.1 | 7.29 | 137.1 |
| lit [2] | 8.03 | 133 | 8.04 | 130 | 7.10 | 130 |
| pc/pℓ, Δθc − ℓ | 0.98 | +2.6 | 0.99 | +7.1 | 1.03 | +7.1 |
| HD 111613, nobs = 1 | ||||||
| meas | 3.20 | 79.1 | 3.08 | 84.0 | 2.77 | 86.8 |
| lit [1] | 3.10 | 81.1 | 3.10 | 80.4 | (80.4) | |
| pc/pℓ, Δθc − ℓ | 1.03 | –2.0 | 0.99 | +3.6 | (+6.4) | |
| HD 147084, nobs = 1 | ||||||
| meas | 4.37 | 36.1 | ||||
| lit [1,3,4] | 4.15 | 31.7 | 4.44 | 32.2 | 4.40 | 31.5 |
| pc/pℓ, Δθc − ℓ | 0.98 | +3.9 | ||||
| HD 154445, nobs = 2 | ||||||
| meas | 3.60 | 91.6 | 3.47 | 94.7 | 2.98 | 96.1 |
| lit [1,3,4] | 3.72 | 89.9 | 3.63 | 89.5 | 3.29 | 90.5 |
| pc/pℓ, Δθc − ℓ | 0.97 | +1.7 | 0.96 | +5.2 | 0.91 | +5.6 |
| HD 183143, nobs = 4 | ||||||
| meas | 5.45 | 1.1 | 5.41 | 2.6 | 4.78 | 4.8 |
| lit [1,3,4] | 6.15 | 179.2 | 5.81 | 178.9 | 5.36 | 179.0 |
| pc/pℓ, Δθc − ℓ | 0.89 | +1.9 | 0.93 | +3.7 | 0.89 | +5.8 |
| mean values | ||||||
| ⟨pc/pℓ⟩ | 0.99 | 0.99 | 0.94 | |||
| ⟨Δθc − ℓ⟩ | +1.5 | +4.5 | +5.8 | |||
| σ [±] | 0.07 | 2.1 | 0.05 | 1.4 | 0.08 | 1.1 |
Notes. The data are corrected for the modulation efficiency ϵmod, the frame transfer smearing ϵft and the telescope polarization. Literature values: 1: Serkowski et al. (1975) for V- and R-band, θ(R) adopted also for θ(I); 2: Whittet et al. (1992); 3: Hsu & Breger (1982) with 0.75 μm band values extrapolated to N_I-band (0.82 μm); 4: Bailey & Hough (1982).
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