Long-term Variability of the Unusual Double-lined Cataclysmic Variable CM Phe

Details Long-term Variability of the Unusual Double-lined Cataclysmic Variable CM Phe Long-term Variability of the Unusual Double-lined Cataclysmic Variable CM Phe

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop...38h&link_type=abstract

NOAO Proposal ID #2002B-0038

Computer Science

Scientific paper

We propose to use the YALO telescope to obtain long-term synoptic optical and IR light curves of the unusual double-lined cataclysmic variable (CV) CM Phe. Recent 0.9-m VI data show variability modulated on candidate orbital periods of 0.1344 d or 0.2683 d, with the longer period favored as the orbital period. Our new YALO light curves will be used to monitor, characterize, and compare the substantial night-to- night variability seen in past short (< 1 week) light curves and in our successful YALO monitoring campaign from the 2001B observing season. In addition, we observed an abrupt transition from bright (V~15.2) to faint (V~16.2) state during 2001B. Recovery time for this state transition appears to be on the order of several months; we hope to observe a repeat of this phenomenon during 2002B. The wide range of variability profiles and time scales observed in CM Phe is exceptional even for a CV, and may be caused by changes in the mass transfer properties linked to solar-like activity on the (possibly evolved) secondary star.

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