Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..202k&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, July 1, 1981, p. 202-209.
Astronomy and Astrophysics
Astrophysics
19
Eclipsing Binary Stars, G Stars, Iue, Resonance Lines, Stellar Evolution, Stellar Mass Accretion, Ultraviolet Spectra, B Stars, Carbon, Gas Streams, Light Curve, Silicon, Spectrum Analysis, Stellar Atmospheres, Stellar Spectra
Scientific paper
Twenty-one mid-ultraviolet and three far-ultraviolet spectra of the close interacting binary U Cephei have been obtained with the International Ultraviolet Explorer. The results show that the gas stream leaves the G star, circuits around the B companion some 270 deg and leaves the binary system, confirming the preliminary results. Additional sources of energy, such as the heating arising from the harmonics of nonlinear modes of oscillation or the heating of the G star's hemisphere by the B star, are required to drive the gas stream out of the system. The far-ultraviolet spectra contain the resonance doublet lines of Si IV and C IV. Their strength is comparable to that which is observed in early B stars. It is suggested that these lines arise from the hot pseudophotosphere created by the infalling matter from the gas stream onto the surface of the B star.
Harvel Ch. A.
Kondo Yoshihiko
McCluskey George E. Jr.
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