First X-Ray Observations during AN Extremely Rare Outburst of WZ SGE

Details First X-Ray Observations during AN Extremely Rare Outburst of WZ SGE First X-Ray Observations during AN Extremely Rare Outburst of WZ SGE

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..736k&link_type=abstract

Chandra Proposal ID #02308056

Physics

Chandra Proposal Id #02308056

Scientific paper

The cataclysmic variable (CV) WZ Sge has unexpectedly gone into outburst on 2001 Jul 23 (IAU Circ 7669). Outbursts were seen in 1913, 1946 and 1978 (e.g. ApJ 248, 1067), suggesting a recurrence time of ~33 years. These extremely rare outbursts, and their decline to quiescence have NEVER been covered in X-rays. With Chandra we have the unique opportunity to study WZ Sge for the first time through these phases. In quiescence the accretion disk is truncated by the white dwarf magnetic field and X-ray oscillations (PASP 110, 403) at 27.9s were observed. In outburst the disk reaches the white dwarf surface (e.g. MNRAS 305, 473) and possibly the oscillations cease to exist. By taking 10 ksec snapshots of WZ Sge 3 times in the next 2-3 months, we will catch WZ Sge in its various states, and get information on accretion rate onto the white dwarf, abundances, and temperatures, etc. (e.g. MNRAS 288, 649). We have requested a DDT on HST as well (PI: E. Sion).

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