Direct Imaging of Betelgeuse

Details Direct Imaging of Betelgeuse Direct Imaging of Betelgeuse

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6529d&link_type=abstract

HST Proposal ID #6529

Other

Hst Proposal Id #6529 Cool Stars

Scientific paper

We obtained an image of Alpha Orionis { Betelgeuse; M2 Iab} using the FOC on HST. This is the first direct image of the surface of a star other than the Sun, and its appearance is dramatically different from the solar disk. The FOC image reveals a greatly extended atmosphere in the ultraviolet, with a diameter about twice that in the visible. Additionally, a bright unresolved spot appears to dominate the ultraviolet continuum flux. The Mg II lines, obtained by tomographic reconstruction with the HRS also show enhanced emission in the spot. We are proposing for long-term status to acquire two observations per year for the next three cycles of HST to determine the position, flux, and evolution of the spot, in order to identify its origin: convection, pulsation, or magnetic activity, and to attempt a direct measurement of a change in radius due to pulsation.

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