Spatially Resolved STIS Spectroscopy of Betelgeuse's Outer Atmosphere

  title={Spatially Resolved STIS Spectroscopy of Betelgeuse's Outer Atmosphere},
  author={A. Lobel and Jason Paul Aufdenberg and Andrea K. Dupree and Robert Louis Kurucz and Robert P. Stefanik and Guillermo Torres},
We present spatially resolved spectra observed with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope of the upper chromosphere and dust envelope of Betelgeuse (α Orionis, M2 Iab). In the fall of 2002 a set of five high-resolution near-UV spectra was obtained by scanning at intensity peak-up position and four off-limb target positions up to one arcsecond, using a small aperture (200 by 63 mas), to investigate the thermal conditions and flow dynamics in the outer atmosphere… 

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