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Paper: Line variations in Betelgeuse
Volume: 9, Cool Stars, Stellar Systems, and the Sun: Sixth Cambridge Workshop
Page: 459
Authors: Toussaint, Frank; Reimers, Dieter
Abstract: The deviations of the observed profiles from a simple photospheric line are extracted at several epochs. The subtraction of two spectra taken in January 1989 shows the shape of the chromospheric CaII K2-component. Explanations for the higher chromospheric activity as compared to the photosphere in 1989 are offered.
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