Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.6314r&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #63.14; Bulletin of the American Astronomical Society, Vol. 25, p.910
Other
Scientific paper
A remarkable X-ray transient from the Einstein Slew Survey, 1ES1113+432, is identified with a nearby, short-period cataclysmic variable. The X-ray outburst reached a peak flux of 43 IPC c/s, which is an order of magnitude above the flux observed from the brightest cataclysmic variables in other X-ray surveys. The outburst spectrum is extremely "soft", with a small percentage of photons having energies greater than 1 keV. The optical counterpart (V=16.5) exhibits a strong UV component, TiO bands from an M star, and broadened Balmer emission lines; these characteristics are reminiscent of AM Her in its low state. The I-band light curves show 0.18 mag modulations at a period of 0.966 h. These are interpreted as ellipsoidal variations in the secondary star for a binary period of 1.932 h, which is near the lower boundary of the "period gap" in the histogram of orbital periods of accreting white dwarfs. Thus, 1ES1113+432 provides the rare opportunity to study a secondary star in an evolved, short-period cataclysmic variable. The flux from the secondary (assumed M6) implies a distance 50 pc. The peak luminosity in the soft X-ray component is then estimated to be 2.6 x 10(32) erg/s, assuming isotropic emission from a blackbody with a temperature 25 eV. Optical outbursts as bright as V 13 were found on photographs from the Harvard Plate Library, confirming the variable nature of the optical counterpart. The historical record suggests that 1ES1113+432 remains in a low accretion state most of the time.
Remillard Ron A.
Schachter Jonathan F.
Silber Andrew D.
Slane Pat
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