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Turbulence in the Atmospheres of Eclipsing Binary Stars

Published online by Cambridge University Press:  12 April 2016

K.O. Wright
K.O. Wright*
Affiliation:
Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics

Abstract:

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A review of the orbits and dimensions of the ζ Aurigae systems is given, based on photometric and spectrographic observations. The Ca II K-line has been studied intensively to determine the extent and uneven structure of the chromospheres of these stars; the multiple structure of this line observed at several eclipses confirms the presence of large-scale clouds in the atmospheres. Measurements of line profiles and equivalent widths show that macroturbulent velocities up to 10 km/sec in the upper chromosphere, and up to 20 km/sec. in the lower chromosphere are present. Microturbulent velocities in the lower chromosphere are about 10 km/sec. Recent ultraviolet observations indicate that the B star in the 32 Cygni system may be within the outer chromosphere of the giant component and its radiation may affect the chromospheric structure more than had previously been suggested.

Type
2. Observed Properties of Stellar Turbulence
Information
International Astronomical Union Colloquium , Volume 51: Stellar Turbulence , 1980 , pp. 144 - 156
Copyright
Copyright © Springer-Verlag 1980

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