Ultraviolet spectroscopy of the interacting binary U Sagittae

Details Ultraviolet spectroscopy of the interacting binary U Sagittae Ultraviolet spectroscopy of the interacting binary U Sagittae

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..382m&link_type=abstract

In its Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 382-386 (SEE N85-20961 11-89)

Astronomy and Astrophysics

Astronomy

3

Absorption Spectra, B Stars, Eclipsing Binary Stars, Iue, Photosphere, Ultraviolet Spectroscopy, Balmer Series, Companion Stars, Line Spectra, Sagittarius Constellation, Spectral Resolution

Scientific paper

The interacting Algol-type binary U Sagittae was observed with the International Ultraviolet Explorer (IUE). Eleven high resolution spectra in the far-ultraviolet and nine high resolution spectra in the mid-ultraviolet were obtained during one orbital cycle in June 1983. The resonance lines of Si IV and C IV are present in absorption of moderate strength at all observed phases. It is assumed that the resonance lines of N V are present at several phases. The presence of Si IV and C IV indicates the existence of regions considerably hotter than a normal B8 V photosphere and are visible at all of the observed phases. The existence and behavior of these features suggests that a hot pseudo-photosphere is created around the B8 star by matter flowing from the G-type companion.

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