Ultraviolet spectroscopy of the interacting binary U Sagittae.
Abstract
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.
- Publication:
-
NASA Conference Publication
- Pub Date:
- December 1984
- Bibcode:
- 1984NASCP2349..382M
- Keywords:
-
- Astronomy;
- Absorption Spectra;
- B Stars;
- Eclipsing Binary Stars;
- Iue;
- Photosphere;
- Ultraviolet Spectroscopy;
- Balmer Series;
- Companion Stars;
- Line Spectra;
- Sagittarius Constellation;
- Spectral Resolution;
- Algol Systems:Interacting Binaries;
- Interacting Binaries:Algol Systems;
- Interacting Binaries:UV Spectra;
- UV Spectra:Interacting Binaries