Wz SGE in Outburst Ten Years Early: i the EUV Emission

Details Wz SGE in Outburst Ten Years Early: i the EUV Emission Wz SGE in Outburst Ten Years Early: i the EUV Emission

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..734w&link_type=abstract

Chandra Proposal ID #02308054

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Chandra Proposal Id #02308054

Scientific paper

WZ Sge is the most extreme dwarf nova. While most dwarf novae exhibit outbursts every few weeks with optical amplitudes of 2-3 magnitudes, WZ Sge waits thirty years between outbursts which then have amplitudes of 7 mag. These have never been studied in X-rays. WZ Sge is in outburst right now (began around July 23.5 UT) presenting a unique opportunity to observe it in outburst with Chandra. We are extremely lucky because the outburst was not expected for another ten years, and may not repeat for another 30 years. In general dwarf novae are weak hard X-ray sources in quiescence and strong EUV sources in outburst. We may expect the same behaviour from WZ Sge though we must also be prepared for unexpected behaviour from such an extreme system. Count rates are highly uncertain, but we may expect WZ Sge to be the brightest EUV source in the sky. We propose LETG spectroscopy to study the EUV component and ACIS-S spectrscopy of the (probably weaker) hard emission.

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