Variable, optically thick, hot plasma observed in interacting binaries

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Binary Stars, Space Plasmas, Stellar Envelopes, Ultraviolet Spectra, Variable Stars, High Temperature Plasmas, Iue, Light Curve, Optical Thickness, Spectral Energy Distribution, Stellar Evolution

Scientific paper

Recent International Ultraviolet Explorer (IUE) observations of two interacting binaries, R Arae and HD 207739 are reported. The ultraviolet spectra indicate the presence of optically-thick, variable hot plasma in those binary systems. These two binaries may belong to a class of binaries that are currently undergoing a rarely observed and probably short-lived phase in their evolution. Their properties are compared with those of two other interacting binaries, U Cephei and Beta Lyrae.

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