Spectroscopic observations of WZ Sagittae during the 1978 outburst

Astronomy and Astrophysics – Astrophysics

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Astronomical Spectroscopy, Eclipsing Binary Stars, Novae, Stellar Spectra, Absorption Spectra, H Beta Line, Helium Ions, Radial Velocity, Stellar Mass Ejection

Scientific paper

Spectroscopic observations at 30 and 15 A/mm are presented of the recurrent nova WZ Sge during its 1978 December outburst. The data cover about two orbital cycles on both December 6 and 7, about 1 mag below maximum light. The spectrum does not resemble that of a nova, or indicate extensive mass outflow, but rather suggests the event was brightening of the accretion disk in the system. Absorption-line radial velocities appear to have amplitudes considerably larger than previously estimated, but may not be entirely orbital. Emission-line intensities and profiles are also presented and discussed. They suggest formation in an enlarged disk, and some contribution from a stream or hot spot whose velocity amplitude is lower than previously observed.

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