Discovery of soft X-ray oscillations in VW Hydri

Details Discovery of soft X-ray oscillations in VW Hydri Discovery of soft X-ray oscillations in VW Hydri

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..219v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 2, Aug. 1987, p. 219-228.

Astronomy and Astrophysics

Astrophysics

24

Cataclysmic Variables, Dwarf Novae, Stellar Oscillations, X Ray Stars, Binary Stars, Periodic Variations, White Dwarf Stars

Scientific paper

In this paper, the discovery of short-period oscillations in the soft X-ray flux, emitted by the dwarf nova VW Hydri during superoutburst, is reported. A modulation of 15 percent, with a period of 14.06 + or - 0.02 s, was detected near the end of the November 1983 superoutburst. The oscillation was observed for two hours, and is coherent to within the limits of observation. A less coherent oscillation was detected near the maximum of the October, 1984 superoutburst. This oscillation shows erratic period changes between 14.2 and 14.4 s. The pulsed emission probably has a harder spectrum than the nonpulsed emission. Upper limits to the amplitude of oscillations during other observations of VW Hydri during normal outburst, superoutburst and quiescence indicate that these 14 s oscillations are a transient effect. The properties, and origin of the soft X-ray oscillations in dwarf novae are discussed.

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