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Periodic photospheric and chromospheric modulation in Alpha Orionis (Betelgeuse)The bright cool supergiant Alpha Orionis has been monitored spectroscopically and photometrically over the past three years (1984-1986) in the optical and the ultraviolet wavelength regions. A 420-day periodic modulation of the flux is observed in the optical and ultaviolet continua, and in the Mg II line emission cores. Periodic photospheric pulsations are the most likely explanation of these observations. This identification is based on the large amplitude of the variation, the correlation of the continuum and chromospheric fluxes, and the length of the observed period. Pulsation may heat and extend the atmosphere of Alpha Ori and initiate the mass flow from the star.
Document ID
19870057381
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dupree, A. K.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Baliunas, S. L.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Hartmann, L.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Nassiopoulos, G. E.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Guinan, E. F.
(Villanova University PA, United States)
Sonneborn, G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
June 15, 1987
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 317
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A44655
Funding Number(s)
CONTRACT_GRANT: NAG5-87
Distribution Limits
Public
Copyright
Other

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