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Table 4

Rotation model parameters of Betelgeuse.

Model PA νeqsini νexp σ res
(°) (km s-1) (km s-1) (km s-1)

28SiO(ν= 2, J = 8−7)
Solid 48.0 ± 1.1 5.47 ± 0.10 20.7 1.44
Solid+Exp 47.6 ± 1.1 5.56 ± 0.10 +0.69 ± 0.08 18.8 1.41

12CO(ν= 0, J = 3−2)
Solid 49.5 ± 1.0 4.82 ± 0.08 12.5 1.13
Solid+Exp 47.9 ± 1.0 4.76 ± 0.08 +0.60 ± 0.06 11.1 1.12

28SiO(ν= 1, J = 8−7)
Solid 51.9 ± 1.3 5.81 ± 0.13 35.8 1.39
Solid+Exp 50.6 ± 1.0 5.73 ± 0.10 +1.75 ± 0.08 20.6 1.34

29SiO(ν= 0, J = 8−7)
Solid 45.5 ± 1.0 5.68 ± 0.09 18.9 1.34
Solid+Exp 45.8 ± 1.0 5.68 ± 0.09 −0.21 ± 0.08 18.7 1.34

Notes. The position angle of the polar axis PA is in degrees east of north. The listed error bars are scaled by to account for the residual dispersion of the fit. They do not comprise the systematic uncertainty that we estimate to ± 3.3° for the position angle of the polar axis PA and ± 0.20 km s-1 for the projected rotation velocity νeqsini (see Sect. 3.5 for details).

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