Variable, optically thick plasma in the interacting binaries R Arae and HD 207739

Details Variable, optically thick plasma in the interacting binaries R Arae and HD 207739 Variable, optically thick plasma in the interacting binaries R Arae and HD 207739

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..580k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 15, 1985, p. 580-588.

Astronomy and Astrophysics

Astronomy

12

Eclipsing Binary Stars, Interstellar Gas, Stellar Mass Accretion, Stellar Spectra, Ultraviolet Astronomy, Iue, Light Curve, Optical Thickness, Radial Velocity, Spectral Energy Distribution, Spectral Line Width

Scientific paper

Two close binaries observed with the IUE, R Ara and HD 207739, exhibit strong variations of spectral energy distribution that indicate the presence of variable, optically thick extrastellar gas. The deepening of the secondary (eclipse-like) minimum toward shorter wavelengths observed in the ultraviolet light curves of R Ara also provides additional strong evidence for the existence of inhomogeneous, optically thick extraneous plasma. The presence of absorption lines of Si IV, C IV, and N V indicates the existence of hotter gas than that implied by the B9 spectral type.

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