Abstract
Observations of the red, bright supergiant star α Ori (Betelgeuse) using the IUE satellite during the past 8 years, show significant variations in the UV line fluxes. Furthermore, different types of lines do not show the same variability. These variations cannot be due to noise since systematic trends in line ratios are seen. Neither the well known long term cyclic variation in radial velocity and visual brightness, nor the relative position of the suggested orbiting inner companion α Ori B, seem to be connected with the observed UV line variations. The short term fluctuations in visual brightness, which are believed to be associated with transient phenomena in the stellar atmosphere, are well correlated with UV line flux variations.
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© 1988 Kluwer Academic Publishers
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Jorås, P., Engvold, O., Elgarøy, Ø. (1988). The Ultraviolet Variability Of Betelgeuse. In: Havnes, O., Pettersen, B.R., Schmitt, J.H.M.M., Solheim, J.E. (eds) Activity in Cool Star Envelopes. Astrophysics and Space Science Library, vol 143. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2951-7_49
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DOI: https://doi.org/10.1007/978-94-009-2951-7_49
Publisher Name: Springer, Dordrecht
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