Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..391..287t&link_type=abstract
Hydrogen-Deficient Stars ASP Conference Series, Vol. 391, proceedings of the conference held 17-21 September, 2007, at Eberhard
Astronomy and Astrophysics
Astronomy
Scientific paper
The two AM Her type systems AI Tri and QS Tel have been monitored with the X-ray satellite XMM-Newton with 20 ksec exposures each and additional optical photometry at several sites during high and intermediate high states of accretion. The light curves are dominated by highly variable soft X-ray emission arising from the accretion heated surface of the white dwarf primary in addition to a weaker hard component reflecting the contribution of the multi-temperature thermal plasma emission from the post-shock accretion column. A mildly absorbed blackbody plus MEKAL plasma emission with variable element abundances describe the associated spectra. Evident discrepancies between the observed X-ray spectrum and the blackbody approximation emphasize the need for accurate models including radiative transfer to reproduce the white dwarf's contribution in a more realistic way.
Dreizler Stefan
Reinsch Klaus
Traulsen Iris
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