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arxiv: 1304.2780 · v1 · pith:GHKXG5GYnew · submitted 2013-04-09 · 🌌 astro-ph.SR

Direct Ultraviolet Imaging and Spectroscopy of Betelgeuse

classification 🌌 astro-ph.SR
keywords ultravioletbetelgeusecontinuumdirectimagesspectroscopyappearancebright
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Direct images of Betelgeuse were obtained over a span of 4 years with the Faint Object Camera on the Hubble Space Telescope. These images reveal the extended ultraviolet continuum emission (about 2 times the optical diameter), the varying overall ultraviolet flux levels and a pattern of bright surface continuum features that change in position and appearance over several months or less. Concurrent photometry and radial velocity measures support the model of a pulsating star, first discovered in the ultraviolet from IUE. Spatially resolved HST spectroscopy reveals a larger extention in chromospheric emissions of Mg II as well as the rotation of the supergiant. Changing localized subsonic flows occur in the low chromosphere that can cover a substantial fraction of the stellar disk and may initiate the mass outflow.

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