ASCA observations of SS Cygni during an anomalous outburst

Details ASCA observations of SS Cygni during an anomalous outburst ASCA observations of SS Cygni during an anomalous outburst

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436l..19n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 436, no. 1, p. L19-L22

Astronomy and Astrophysics

Astrophysics

15

Accretion Disks, Cataclysmic Variables, Dwarf Novae, Stellar Mass Accretion, Stellar Models, X Ray Spectroscopy, Bremsstrahlung, Companion Stars, Imaging Spectrometers, Stellar Luminosity

Scientific paper

SS Cygni was observed by the ASCA satellite on 1993 May 27, the first cataclysmic variable studied by ASCA. The observations were conducted while the system was in an outburst of the 'anomalous' variety. The SIS spectrum cannot be explained by two-temperature Raymond-Smith coronal plasma models as invoked in previous studies with lower spectral resolution. Significantly better agreement is found for models with plasma emission at kT = 0.8, 3.5 keV and thermal bremsstrahlung at kT = 18 keV. The gas imaging spectrometer (GIS) data are consistent with the solid state imaging spectrometer (SIS) data, showing evidence for Fe line emission but showing no evidence of pulsation over times ranging from seconds to minutes. These observations seem at variance with standard theory in two regards: we simultaneously see hard X-rays and optically thin soft X-rays while the system is in outburst, and we see a nonsmooth emission measure distribution. We speculate on possible scenarios which might resolve these differences.

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