Spatially Resolved Ultraviolet Spectroscopy of the Great Dimming of Betelgeuse

  title={Spatially Resolved Ultraviolet Spectroscopy of the Great Dimming of Betelgeuse},
  author={A. Dupree and K. Strassmeier and L. Matthews and H. Uitenbroek and T. Calderwood and T. Granzer and E. Guinan and R. Leike and M. Montarg{\`e}s and A. Richards and R. Wasatonic and Michael Weber Center for Astrophysics HarvardSmithsonian and Cambridge and Ma and Usa and L. F. Astrophysik and Potsdam and H Germany and Mit and H. Observatory and Westford and National Solar Observatory and Boulder and Co and Aavso and V. University and Villanova and Pa and Usa Harvard-Smithsonian Center for Astrophysics and Garching and Ludwig-Maximilians-Universitaat and Munich and I. O. Astronomy and K. Leuven and Leuven and Belgium and J. B. C. F. Astrophysics and U. Manchester and Manchester and UK.},
  journal={arXiv: Solar and Stellar Astrophysics},
The bright supergiant, Betelgeuse (Alpha Orionis, HD 39801) experienced a visual dimming during 2019 December and the first quarter of 2020 reaching an historic minimum 2020 February 7$-$13. During 2019 September-November, prior to the optical dimming event, the photosphere was expanding. At the same time, spatially resolved ultraviolet spectra using the Hubble Space Telescope/Space Telescope Imaging Spectrograph revealed a substantial increase in the ultraviolet spectrum and Mg II line… Expand

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