Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..777h&link_type=abstract
Astrophysical Journal, vol. 206, June 15, 1976, pt. 1, p. 777-784.
Astronomy and Astrophysics
Astronomy
13
Eclipsing Binary Stars, Far Ultraviolet Radiation, Satellite Observation, Ultraviolet Spectra, Adsorption, Astronomical Spectroscopy, Line Spectra, Oao 3, Radial Velocity, Spaceborne Astronomy
Scientific paper
Results are presented for medium- and high-resolution observations of the far-UV spectrum of Beta Lyrae, which were made with the Copernicus satellite spectrometers at phases 0.0, 0.2, 0.3, 0.5, and 0.8. These are compared with previous observations made at phases 0.0, 0.25, 0.5, and 0.75. It is found that the spectral range between 1000 and 1300 A is dominated by emission lines which show very little variation in intensity and radial velocity with phase, indicating that they are collisionally excited in an extended envelope surrounding the whole system. The P Cygni absorptions indicate expansion velocities ranging from -120 to -170 km/s. No He II emission contribution to the N II lines at 1085 A is observed, strongly suggesting nonradiative processes, and no stellar lines at all are seen in the far-UV spectrum. It is concluded that the mass exchange in Beta Lyrae is not conservative and that the system as a whole is losing mass.
Hack Margherita
Hutchings John B.
Kondo Yoshihiko
McCluskey George E.
Tulloch M. K.
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