Artículo de revista
DISCOVERY AND CHARACTERIZATION OF AN EXTREMELY DEEP-ECLIPSING CATACLYSMIC VARIABLE: LSQ172554.8-643839
Fecha
2011-05-01Registro en:
ASTROPHYSICAL JOURNAL Volume: 732 Issue: 1 Article Number: 51 Published: MAY 1 2011
0004-637X
DOI: 10.1088/0004-637X/732/1/51
Autor
Rabinowitz, David
Tourtellotte, Suzanne
Rojo, Patricio
Hoyer, Sergio
Folatelli, Gastón
Coppi, Paolo
Baltay, Charles
Bailyn, Charles
Institución
Resumen
We report the discovery of an eclipsing cataclysmic variable with eclipse depths > 5.7 mag, orbital period 94.657 minutes, and peak brightness V similar to 18 at J2000 position 17(h)25(m)54(s). 8, -64 degrees 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 angstrom 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(-1), oscillating with radial velocity that peaks at mid deep eclipse with semi-amplitude 500 +/- 22 km s(-1). 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.