Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17118m&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The dwarf nova SS Cygni was observed in outburst in 1999 June simultaneously with the Extreme Ultraviolet Explorer and the Hubble Space Telescope (HST). The HST data provide the first detection of the quasi-coherent oscillations (so-called ``dwarf nova oscillations'') of SS Cyg in the ultraviolet (UV). The UV oscillation is observed to have the same period (≈ 9 s) and phase, but lower amplitude (≈ 1% compared to ≈ 20%) than the extreme-ultraviolet (EUV) oscillation. Amazingly, the UV oscillation appears only in the blueshifted absorption component of the C IV λ 1549 P Cygni profile. SS Cyg was also observed in outburst in 2001 January with the Chandra X-ray Observatory Low Energy Transmission Grating Spectrometer. The Chandra data provide the first complete measurement of the EUV/soft X-ray spectrum of SS Cyg, and the spectrum of its EUV/soft X-ray oscillations. The EUVE, HST, and Chandra data are used to place constraints on the cause and nature of the dwarf nova oscillations of SS Cyg.
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