Ultraviolet Spectroscopy of the Unexpected Outburst of WZ Sagittae

Details Ultraviolet Spectroscopy of the Unexpected Outburst of WZ Sagittae Ultraviolet Spectroscopy of the Unexpected Outburst of WZ Sagittae

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9304s&link_type=abstract

HST Proposal ID #9304

Physics

Hst Proposal Id #9304 Hot Stars

Scientific paper

Unexpectedly, the extreme dwarf nova WZ Sge went into outburst on July 23, 2001, ten years earlier than anticipated. This event offers the chance to obtain high-quality, time-resolved far-UV spectra with STIS, as the outburst continues through its peak into decline. we propose to monitor spectroscopic changes with STIS once a month for 4 months as the system transitions from a brightening disk-dominated system to a white dwarf-dominated system. Our modeling of the luminous disk-dominated phase with combinations of model accretion disks {with vertical structure} and high gravity photospheres will reveal changes in the accretion rate as accretion proceeds during the outburst, spectroscopic changes in the white dwarf {cooling rate in response to heating we will model hydrodynamically}, changes in chemical abundances brought about by accretion, diffusion and mixing, and changes in the rotation rate of the white dwarf and its accretion belt, if present. The outburst coverage will monitor spectroscopic profile shape and velocity signatures of outflow, external circumbinary ring formation, and signs of infall due to possible re-accretion of previously ejected matter {cf.Leibowitz and Mazeh, 1981, ApJ and references therein}. We are coordinating extensive multi-wavelength coverage.

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