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Alpha Ori - Evidence for pulsationThe study deals with a periodic modulation of the UV continuum and Mg II emission-line fluxes shown by the bright cool supergiant Alpha Orionis; this pulsation is identified with the supergiant's atmosphere. UV brightness is shown to occur near the time of maximum outflow velocity of the photosphere, while local minima in the UV continuum occur near the time of maximum infall velocity. Visible and UV observations of Alpha Ori since the beginning of the monitoring program with IUE are discussed.
Document ID
19910044311
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
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)
Guinan, E. F. (Villanova University PA, United States)
Sonneborn, G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Astrophysics
Meeting Information
Meeting: Confrontation between Stellar Pulsation and Evolution
Location: Bologna
Country: Italy
Start Date: May 28, 1990
End Date: May 31, 1990
Accession Number
91A28934
Funding Number(s)
CONTRACT_GRANT: NAG5-87
Distribution Limits
Public
Copyright
Other

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