Variability and System Parameters of the Double-lined Cataclysmic Variable Phe 1

Details Variability and System Parameters of the Double-lined Cataclysmic Variable Phe 1 Variability and System Parameters of the Double-lined Cataclysmic Variable Phe 1

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop...51h&link_type=abstract

NOAO Proposal ID #2001B-0051

Computer Science

Scientific paper

We propose to use the CTIO 4-m and 0.9-m telescopes to obtain simultaneous time-resolved spectra and multi-band light curves of the double-lined cataclysmic variable (CV) Phe 1. Recent 0.9-m VI data show variability modulated on candidate orbital periods of 0.1344 d or 0.2683 d. Time-resolved spectra will allow a conclusive determination of P_orb and construction of radial velocity curves. Since Phe 1 is a rare CV whose spectrum shows features from the secondary, radial velocity measurements can be used to determine the masses of both component stars. Reliable mass estimates for either star are known in less than 2% of all CVs. In addition to constraining models of CV evolution, mass measurements of CV secondaries can be applied to the study of isolated low mass stars. CVs may be progenitors of type Ia supernovae, so contributions to the overall mass distribution of WDs in CVs are also important. We will also use the YALO telescope to obtain long-term (6-month) optical and IR light curves to monitor and characterize the substantial night-to-night variability seen in past short (< 1 week) light curves. This may be caused by changes in the mass transfer properties linked to solar-like activity on the secondary star.

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