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High Luminosity F-K Stars Motions and Hα Emissions

Published online by Cambridge University Press:  12 April 2016

J. Smolinski ,
J.L. Climenhaga  and
B.L. Harris
J. Smolinski
Affiliation:
Department of Physics, University of Victoria, Victoria, B.C., Canada
J.L. Climenhaga
Affiliation:
Department of Physics, University of Victoria, Victoria, B.C., Canada
B.L. Harris
Affiliation:
Department of Physics, University of Victoria, Victoria, B.C., Canada

Abstract

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Changes and differences in radial velocities between neutral and ionized metals have been found for three F5-type supergiants: HD 231195, HD 10494, and HD 17971. Fifteen high dispersion coudé spectrograms (6 Å/mm) were used and 33 to 165 lines were measured on each. Semi-regular time variations up to about 8 km s-1 in radial velocity have been found. In addition, Hα line profiles for 8 high luminosity F-K stars have been analyzed. All of the stars show Ha emissions, variable in time, which is probably a common phenomenon in very luminous stars. Metallic emission lines with low excitation potentials, in particular the Ca I 6572.8 and the Fe I 6574.2 lines, are present in 5 of these stars.

Type
2. Observed Properties of Stellar Turbulence
Information
International Astronomical Union Colloquium , Volume 51: Stellar Turbulence , 1980 , pp. 170
Copyright
Copyright © Springer-Verlag 1980