V723 Cas: A Dying Nova or a New-born SSS?

Details V723 Cas: A Dying Nova or a New-born SSS? V723 Cas: A Dying Nova or a New-born SSS?

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hrxs.confe..25n&link_type=abstract

High Resolution X-ray Spectroscopy: towards XEUS and Con-X, Proceedings of the international workshop held at the Mullard Space

Physics

Scientific paper

The old Classical Nova V723 Cas (1995) was detected in X-rays with the XRT aboard Swift. Recent observations of optical emission lines from highly ionized iron motivated the 7-ksec observation, and the nova was observed to still be active with an X-ray emission level of 7.8 x 10-13 erg/cm2/s. The spectrum is that of a Super-Soft-Source (SSS) and peaks at about 0.4 keV. An absorbed blackbody with T ~ 320,000 K (about 27 eV), NH = 1.7 x 1021 cm-2 and RWD ~ 6000 km (log LX=36.4) results in a remarkably good fit to the spectrum. The fact that V723 Cas was found with a SSS spectrum 11 years after the outburst makes this a candidate for a classical nova that has evolved into a permanent SSS according to theoretical calculations by our group. If further observations show that it is still on, we have likely witnessed the white dwarf in a Classical nova beginning its growth to the Chandrasekhar limit.

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