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Contact Binary Stars

Published online by Cambridge University Press:  12 April 2016

A.K. Dupree
A.K. Dupree*
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 U.S.A.

Abstract:

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Ultraviolet and X-ray surveys of the W Ursae Majoris type stars are reviewed. These systems exhibit extended coronas and transition regions that are confined close to the optically determined surfaces. Correlations of X-ray activity with period or rotational velocity indicate a turn-over or saturation of emission at the short periods or high velocities found in the W UMa-type systems. For a number of systems, ultraviolet emission appears to be anti-correlated with the strength of X-ray emission. These observations are discussed in terms of solar structures, activity, and evolution.

Type
Session III: Observed Activity in Related Objects
Information
International Astronomical Union Colloquium , Volume 71: Activity in Red-Dwarf Stars , 1983 , pp. 447 - 461
Copyright
Copyright © Reidel 1983

References

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