The close circumstellar environment of Betelgeuse - V. Rotation velocity and molecular envelope properties from ALMA

  title={The close circumstellar environment of Betelgeuse - V. Rotation velocity and molecular envelope properties from ALMA},
  author={Pierre Kervella and Leen Decin and Anita M. S. Richards and Graham M. Harper and Iain McDonald and Eamon O’Gorman and Miguel Montarg{\`e}s and Ward Homan and Keiichi Ohnaka},
  journal={arXiv: Solar and Stellar Astrophysics},
We observed Betelgeuse using ALMA's extended configuration in band 7 (f~340 GHz, {\lambda}~0.88 mm), resulting in a very high angular resolution of 18 mas. Using a solid body rotation model of the 28SiO(v=2,J=8-7) line emission, we show that the supergiant is rotating with a projected equatorial velocity of v_eq sin i = 5.47 +/- 0.25 km/s at the equivalent continuum angular radius R_star = 29.50 +/- 0.14 mas. This corresponds to an angular rotation velocity of {\omega} sin i = (5.6 +/- 1.3) x… 
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