Astrophys. J., 732, 51 (2011/May-1)
Discovery and characterization of an extremely deep-eclipsing cataclysmic variable: LSQ172554.8-643839.
RABINOWITZ D., TOURTELLOTTE S., ROJO P., HOYER S., FOLATELLI G., COPPI P., BALTAY C. and BAILYN C.
Abstract (from CDS):
We report the discovery of an eclipsing cataclysmic variable with eclipse depths >5.7 mag, orbital period 94.657 minutes, and peak brightness V ∼ 18 at J2000 position 17h25m54.s8, -64°38'39''. Detected by visual inspection of images from Yale University's QUEST camera on the European Southern Observatory 1.0 m Schmidt telescope at La Silla, we obtained light curves in B, V, R, I, z, and J with SMARTS 1.3 m and 1.0 m telescopes at Cerro Tololo and spectra from 3500 to 9000 Å with the SOAR 4.3 m telescope at Cerro Pachon. The optical light curves show a deep, 5-minute eclipse immediately followed by a shallow 38-minute eclipse and then sinusoidal variation. No eclipses appear in J. During the deep eclipse we measure V-J > 7.1, corresponding to a spectral type M8 or later secondary, consistent with the dynamical constraints. The estimated distance is 150 ps. The spectra show strong hydrogen emission lines, Doppler broadened by 600-1300 km/s, oscillating with radial velocity that peaks at mid deep eclipse with semi-amplitude 500±22 km/s. We suggest that LSQ172554.8-643839 is a polar with a low-mass secondary viewed at high inclination. No known radio or X-ray source coincides with the new object's location.
binaries: eclipsing - novae, cataclysmic variables - stars: dwarf novae
LSQ J172554.8-643839 N=1.
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