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The Very Unusual Ultraviolet Spectra of R Arae

Published online by Cambridge University Press:  12 April 2016

Yoji Kondo  and
George E. McCluskey
Yoji Kondo
Affiliation:
Laboratory for Astronomy and Solar Physics, NASA/GSFC Greenbelt, MD 20771, U.S.A.
George E. McCluskey
Affiliation:
Department of Mathematics, Lehigh University, Bethlehem, PA 18015, U.S.A.

Abstract

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The high resolution ultraviolet spectra of the 4.4-day period binary R Arae, observed in 1980 with the International Ultraviolet Explorer (IUE), show that its continuum flux level varied outside of eclipse by more than a factor of two in ten days, and by over 50 percent within a same orbital cycle. The flux level varied non-monotonically at different wavelengths. The resonance lines of Mg II and Si IV exhibited shortward–shifted absorption components near phase 0.4, indicating the presence of a gas stream toward the observer at a velocity of some –450 to –500 km s–1. Our observations of R Arae with the Einstein satellite show it to be an X–ray source.

Type
Part III: Evolutionary Processes in Close Binary Systems
Information
International Astronomical Union Colloquium , Volume 69: Binary and Multiple Stars as Tracers of Stellar Evolution , 1982 , pp. 321 - 326
Copyright
Copyright © Reidel 1982

References

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