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

@article{Kervella2017TheCC,
title={The close circumstellar environment of Betelgeuse - V. Rotation velocity and molecular envelope properties from ALMA},
author={P. Kervella and L. Decin and A. Richards and G. Harper and I. McDonald and E. O'Gorman and M. Montarg{\e}s and W. Homan and K. Ohnaka},
journal={arXiv: Solar and Stellar Astrophysics},
year={2017}
}`
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… Expand
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