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Line Brightness Variations in Alpha Orionis - Phase Differences and Radial Velocities

Published online by Cambridge University Press:  12 April 2016

P. Joras
P. Joras*
Affiliation:
Institute of Theoretical Astrophysics, University of Oslo., P.O. Box 1029, N-0315 Oslo 3, Norway

Extract

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Observations of the red, bright supergiant star a Orionis (Betelgeuse) during the past decade show significant variations in UV line fluxes and line shifts. Dupree et al. (1987) pointed out that the data from 1984-1987 indicates a periodicity of slightly more than one year in the B magnitude, UV continuum, and Mg II emission line fluxes. Our data shows that this conclusion applies to other strong and medium strong chromospheric lines as well. The variations seem to affect also the relative strength of lines within multiplets.

Type
4. The Variability-Evolution Connection
Information
International Astronomical Union Colloquium , Volume 106: Evolution of Peculiar Red Giant Stars , 1989 , pp. 299
Copyright
Copyright © Cambridge University Press 1989

References

Dupree, A.K., Baliunas, S.L., Guinan, E.F., Hartman, L., Nassiopoulos, G.E. and Sonneborn, G. 1987, Ap. J.. 317, L85–L89.Google Scholar