Table 1
Log of observations of Betelgeuse and polarimetric measurements (for details, see Sects. 2 and 5).
| Date | Stokes | PL1 | θ1 | χ1 | μ1 | P L 2 | θ 2 | χ 2 | μ 2 | |
| 10-4 | ° | ° | ° | 10-4 | ° | ° | ° | |||
|
|
||||||||||
| 27 November 2013 ∈ Set 1 | 2Q2U | 6.8 | 23.2 | 113.2 | 73.0 | 3.4 | 122.0 | 212.0 | 84.0 | |
| 11 December 2013 ∈ Set 1 | 2Q2U | 8.4 | 22.0 | 112.0 | 73.0 | 4.3 | 120.1 | 210.1 | 81.9 | |
| 20 December 2013 ∈ Set 1 | 2Q2U | 8.3 | 22.7 | 112.7 | 73.0 | 4.7 | 121.3 | 211.3 | 81.9 | |
| 09 January 2014 ∈ Set 1 | 2Q2U | 6.0 | 24.9 | 114.9 | 70.8 | 4.9 | 124.5 | 214.5 | 84.0 | |
| 08 April 2014 | 1Q1U | 4.7 | 26.7 | 116.7 | 66.4 | 4.2 | 103.7 | 193.7 | 81.9 | |
| 12–13 September 2014 ≡ Set 2 | 8Q8U | 5.8 | 39.4 | 129.4 | 73.0 | 3.5 | 119.2 | 209.2 | 84.0 | |
| 16 October 2014 | 8Q8U | 4.5 | 35.2 | 125.2 | 79.4 | 3.4 | 103.3 | 193.3 | 79.4 | |
| 23 October 2014 | 8Q8U | 3.6 | 37.0 | 127.0 | 81.4 | 3.6 | 103.3 | 193.3 | 81.4 | |
| 20 November 2014 | 8Q8U | 4.9 | 45.0 | 135.0 | 79.4 | 2.8 | 112.5 | 202.5 | 77.7 | |
| 18 December 2014 | 8Q8U | 5.1 | 51.9 | 141.9 | 77.2 | 2.9 | 125.3 | 215.3 | 79.8 | |
| 03 March 2015 | 8Q8U | 2.7 | 68.7 | 158.7 | 77.2 | 2.9 | 146.9 | 236.9 | 77.7 | |
| 13 April 2015 | 8Q8U | 5.1 | 90.4 | 180.4 | 75.1 | 2.2 | 161.8 | 251.8 | 75.6 | |
Notes. Columns present the date, the number of Stokes QU spectra obtained, then for the two spots (spot1 and spot2 modeled in Sect. 5) the observed maximum of linear polarization PL, polarization angle θ, position angle χ, and projection angle μ.
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