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- Title
DIRECT ULTRAVIOLET IMAGING AND SPECTROSCOPY OF BETELGEUSE.
- Authors
Dupree, A. K.; Stefanik, R. P.
- Abstract
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 (~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.
- Subjects
BETELGEUSE; FAINT Object Camera; HUBBLE Space Telescope (Spacecraft); ULTRAVIOLET radiation; ASTRONOMICAL photometry; RADIAL velocity of stars; SUBSONIC flow
- Publication
EAS Publications Series, 2013, Vol 60, p77
- ISSN
1633-4760
- Publication type
Article
- DOI
10.1051/eas/1360008