Table 1
Log of Narval (Stokes U and Q) observations of Betelgeuse and polarimetric measurements (see Sect. 6).
| Date | Stokes |  |
θ1 | χ1 | μ1 |  |
θ2 | χ2 | μ2 |
|---|---|---|---|---|---|---|---|---|---|
| 10−4 | ° | ° | ° | 10−4 | ° | ° | ° | ||
| 18–19 September 2015 | 8Q8U | 2.6 | 48.0 | 138.0 | 77.3 | 2.6 | 120.5 | 210.5 | 77.7 |
| 16 October 2015 | 8Q8U | 2.7 | 34.6 | 124.9 | 73.0 | 3.0 | 121.2 | 211.2 | 77.7 |
| 09 December 2015 | 8Q8U | 2.4 | 78.1 | 168.1 | 83.6 | 1.7 | 133.1 | 223.1 | 77.8 |
| 20–21 January 2016 | 8Q8U | 1.6 | 90.3 | 180.3 | 81.5 | 1.6 | 145.6 | 235.6 | 77.8 |
| 16 February 2016 | 8Q8U | 0.5 | 87.5 | 177.5 | 79.4 | 0.2 | 162.3 | 252.3 | 82.0 |
| 12 March 2016 | 4Q4U | 2.6 | 28.7 | 118.7 | 77.3 | 0.8 | 93.2 | 183.2 | 64.7 |
| 06 April 2016 | 4Q4U | 2.4 | 17.9 | 107.9 | 70.9 | 0.8 | 107.1 | 197.1 | 66.9 |
| 11 September 2016 | 4Q4U | 1.8 | 25.2 | 115.2 | 73.0 | 1.7 | 106.3 | 196.3 | 60.0 |
| 08 October 2016 | 4Q4U | 2.7 | 17.7 | 107.7 | 73.0 | 1.8 | 108.9 | 198.9 | 62.4 |
| 01 November 2016 | 4Q4U | 2.6 | 18.2 | 108.2 | 70.9 | 1.8 | 99.0 | 189.0 | 71.3 |
| 03 December 2016 | 4Q4U | 2.5 | 45.0 | 135.0 | 75.2 | 1.6 | 102.3 | 192.3 | 73.5 |
| 18 December 2016 | 4Q4U | 2.6 | 52.0 | 142.0 | 75.2 | 1.6 | 115.7 | 205.7 | 75.6 |
| 17 February 2017 | 4Q4U | 1.7 | 106.2 | 196.2 | 79.4 | 1.1 | 7.1 | 97.1 | 73.5 |
| 03 April 2017 | 2Q2U | 1.4 | 24.7 | 114.7 | 70.9 | 1.2 | 178.4 | 268.4 | 75.6 |
| 11 April 2017 | 2Q2U | 1.8 | 18.4 | 108.4 | 70.9 | 0.9 | 176.6 | 266.6 | 71.3 |
| 17 April 2017 | 2Q2U | 1.7 | 18.2 | 108.2 | 70.9 | 0.8 | 175.2 | 265.2 | 71.3 |
Notes. We note that previous QU measurements are summarized by Aurière et al. (2016). Columns give the date, the number of Stokes QU obtained, then for spot1 and spot2, observed maximum of linear polarization PL , polarization angle θ, position angle χ, and angle to center μ.
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