Optically-thick, highly-variable plasma in interacting binaries

Details Optically-thick, highly-variable plasma in interacting binaries Optically-thick, highly-variable plasma in interacting binaries

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.218..409k&link_type=abstract

In ESA 4th European IUE Conf. p 409-410 (SEE N84-35135 24-88)

Computer Science

Eclipsing Binary Stars, Interstellar Gas, Stellar Evolution, Stellar Spectra, Absorption Spectra, Iue, Stellar Composition

Scientific paper

The interacting binaries HD 207739 and R Arae were observed by IUE. The ultraviolet spectrum of HD 207739 undergoes complex variations in both the lines and the continuum. Considerable circumstellar matter is present; R Arae (B9p + ?) exhibits SiIV, CIV and even NV absorption features. Both the lines and continuum are variable. An unusual secondary eclipse which is deeper in the ultraviolet than in the visible is present near phase 0.6. The CII line has a P cygni profile with emission present at all observed phases. These systems are probably in a relatively short-lived phase of evolution which is not often observed.

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