Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19310101m&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #101.01; Bulletin of the American Astronomical Society, Vol. 30, p.1399
Astronomy and Astrophysics
Astrophysics
Scientific paper
Cataclysmic Variables (CVs) are believed to contain optically thin, X-ray emitting plasmas which cool from kT ~ 10 keV down the photospheric temperature of the underlying white dwarf. Early X-ray spectra of CVs were fitted with a single temperature bremsstrahlung model. However, with the ever improving quality of the data, increasingly sophisticated spectral models have been used to fit their X-ray spectra. Most recently, the use of multi-temperature plasma models, either with several discrete temperature components or using a differential emission measure approach, is becoming commonplace. All such efforts rely on the existing plasma codes, such as mekal, and they typically predict a strong Fe L complex emission around 1 keV, due to the kT ~ 1 keV plasma. In this poster, I will present an ASCA SIS spectral atlas of CVs focusing on the Fe-L complex region. The spectral resolution of the SIS instruments is such that, while individual features in the complex cannot be resolved, the complex as a whole is readily resolvable, if it is present in the data. The atlas will show that the strength of the Fe L complex varies considerably from system to system, and is consistent with 0 in many CVs. It is likely that the coronal approximation, inherent in the existing plasma codes, is inappropriate for CVs. I will discuss physical and astrophysical implications of this finding.
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