Far-UV and extreme-UV observations of SS CYG and U GEM from Voyagers 1 and 2

Astronomy and Astrophysics – Astronomy

Scientific paper

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Dwarf Novae, Spaceborne Astronomy, Ultraviolet Astronomy, Voyager Project, Accretion Disks, Extreme Ultraviolet Radiation, Far Ultraviolet Radiation, Light Curve, Wavelengths

Scientific paper

The authors report on observations of the dwarf novae SS Cyg and U Gem obtained with the Voyager UV spectrometers in the 500 - 1200 Å region. SS Cyg has been detected in quiescence at a flux level of 9×10-13erg cm-2s-1Å-1 at 1000 Å. U Gem was not detected in quiescence. No emission shortward of the Lyman limit (912 Å) is detected in either star. A far-UV (λeff = 1050 Å) light curve for an outburst in SS Cyg is presented. Evidence for a wind in the Lyman lines of hydrogen is seen in SS Cyg. No evidence of a wind was observed in U Gem.

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