Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.3903s&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #39.03; Bulletin of the American Astronomical Society, Vol. 33, p.1362
Astronomy and Astrophysics
Astronomy
Scientific paper
WZ Sge is the prototypical evolved cataclysmic variable harbouring a white dwarf that has transformed its nearby companion star from a main sequence star into a low mass dwarf via gigayears of mass transfer. In July 2001, the system went into one of its rare outburst states around 10 years earlier than expected. I present some highlights from the multi-wavelength campaign covering the 2001 outburst event. The vast amount of data secured during this event provides an unprecedented coverage of a dwarf nova outburst. Complex line profile variability is present across all wavebands with remarkable similarity between optical, UV (HST) and X-ray (Chandra) line profiles. Optical spectroscopy in the first few days of the outburst revealed a hot accretion disc dominated by two spiral arms. Doppler tomography of the disc indicates a weakening of the spirals throughout the first weeks of the outburst while at the same time a bright spot signature is increasing in strength. The mass donor also revealed itself for the first time through narrow emission line components, directly constraining WZ Sge's system parameters.
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