ASCA Observations of the Super-soft Sources CAL87 and RXJ0925.7--475

Details ASCA Observations of the Super-soft Sources CAL87 and RXJ0925.7--475 ASCA Observations of the Super-soft Sources CAL87 and RXJ0925.7--475

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.7719e&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #77.19; Bulletin of the American Astronomical Society, Vol. 28, p.1376

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Scientific paper

Dozens of Super-Soft Sources (SSS) have been discovered and studied with Einstein and ROSAT. It is generally believed that SSS are binary systems in which soft X-rays are produced through nuclear burning on the accreting white dwarves. The ASCA satellite has observed the two ``hardest'' super-soft sources CAL87 and RXJ0925.7--475, which are practically the only SSS emitting enough number of photons in the ASCA SIS band (> 0.4 keV). CAL87 indicates a strong OVII edge at 0.74 keV and a flat spectrum below the edge. This is as expected from theoretical LTE/NLTE spectral models of white-dwarf atmosphere at Teff ~ 8 x 10(5) K. On the other hand, the OVIII and NeIX absorption edges in RXJ0925.7--475, which are expected from the LTE/NLTE models, are much weaker, and instead the NeX edge is observed. We will present the results of detailed energy spectral analysis and discuss possible origin of the difference of the two energy spectra.

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