Multiwavelength monitoring of the dwarf nova VW Hydri. IV - Voyager observations

Details Multiwavelength monitoring of the dwarf nova VW Hydri. IV - Voyager observations Multiwavelength monitoring of the dwarf nova VW Hydri. IV - Voyager observations

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..131p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 1, 1987, p. 131-140.

Astronomy and Astrophysics

Astronomy

30

Binary Stars, Dwarf Novae, Far Ultraviolet Radiation, Light Curve, Spaceborne Astronomy, Ultraviolet Astronomy, Absorption Spectra, Spectral Energy Distribution, Spectrum Analysis, Voyager Project

Scientific paper

Results from Voyager far-ultraviolet (500-1200 A) observations of the dwarf nova VW Hyi are presented as part of a coordinated, multiwavelength program. Data from one normal outburst and one superoutburst are discussed in detail. Far-ultraviolet (1050 A) light curves are produced showing a significant delay (0.5 day) in the rise to maximum at 1050 A with respect to optical wavelength, followed by a simultaneous decline. The superoutburst data show a distinct double-peaked light curve with the first rise and decline closely resembling that of a normal outburst. These data suggest that the rise to supermaximum in the far-ultraviolet is also delayed with respect to optical wavelengths. The spectral distribution of VW Hyi shows the steeply falling spectrum shortward of 1200 A, characteristic of dwarf novae in outburst and absorption features at 985 (N III, C III and Ly gamma) and 1030 (Ly beta and O VI). No flux shortward of 912 A was detected in VW Hyi.

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