Extreme-ultraviolet observations of dwarf novae from Apollo-Soyuz

Details Extreme-ultraviolet observations of dwarf novae from Apollo-Soyuz Extreme-ultraviolet observations of dwarf novae from Apollo-Soyuz

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..167m&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Aug. 15, 1978, p. 167-170. Research supported by the University of California;

Astronomy and Astrophysics

Astronomy

23

Apollo Soyuz Test Project, Dwarf Stars, Far Ultraviolet Radiation, Novae, Spaceborne Astronomy, X Ray Sources, Photomultiplier Tubes, Radiant Flux Density, Radiation Detectors, Stellar Spectrophotometry

Scientific paper

The paper reports on EUV observations of four dwarf novae (SS Cyg, Z Cha, VW Hyi, and AE Aqr) in July 1975 during the Apollo-Soyuz Test Project, which were performed by using pointed grazing-incidence optics and a channel-electron multiplier as a photon detector. An EUV flux in the range from 55 to 150 A was detected from SS Cyg during an optical outburst at an intensity level considerably below that of Rappaport et al. (1974). Upper limits are placed on the EUV fluxes from Z Cha, VW Hyi, and AE Aqr. Multicolor optical photometry of SS Cyg and AE Aqr is also examined which was obtained simultaneously with the EUV observations. It is concluded that intrinsic EUV flux variability is probably a characteristic of SS Cyg and that the same system exhibits an extremely large range of soft X-ray luminosities while remaining at about the same visible light level. Several models for the SS Cyg system are compared with the EUV data.

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