IUE observations of gas stream effects in the ultraviolet spectrum of U Cephei

Details IUE observations of gas stream effects in the ultraviolet spectrum of U Cephei IUE observations of gas stream effects in the ultraviolet spectrum of U Cephei

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..906k&link_type=abstract

Astrophysical Journal, Part 1, vol. 233, no. 3, Nov. 1, 1979, p. 906-912.

Astronomy and Astrophysics

Astronomy

27

B Stars, Eclipsing Binary Stars, Gas Streams, Spaceborne Astronomy, Ultraviolet Spectra, Absorption Spectra, Far Ultraviolet Radiation, G Stars, High Resolution, Iue, Line Spectra, Radial Velocity

Scientific paper

The eclipsing binary U Cephei has been observed with the International Ultraviolet Explorer (IUE) satellite. Nine high-resolution spectra in the mid-ultraviolet (1900-3200 A) and one high-resolution spectrum in the far-ultraviolet (1200-1900 A) were obtained. The effects of gas streaming are clearly seen in the mid-ultraviolet resonance lines of Fe II (2599 A) and Mg II (2795 and 2802 A). The data indicate that much of the gas leaving the G star circles behind the B star and leaves the system. It is suggested that g-mode oscillations in the G star supply part of the energy required to drive the gas out of the system.

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