Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11621k&link_type=abstract
HST Proposal ID #11621. Cycle 17
Other
Scientific paper
The eclipsing cataclysmic variable {CV} SDSS J1507 has an orbital period well below the period minimum obeyed by other CVs. Furthermore, it contains a cool, pulsating primary white dwarf {WD} and a sub-stellar brown-dwarf {BD} companion. We have now discovered that J1507 is also a high proper motion star, with a transverse velocity much higher than other CVs. These characteristics can all be reconciled if the system is the first Galactic halo CV to be discovered. However, there is one possible alternative explanation, according to which the system formed only recently from a detached WD-BD binary system. Here, we propose a definitive test of these two scenarios by using time-resolved, FUV + NUV spectroscopy to determine the metallicity of the system. The outcome of this test will have an immediate impact on our understanding of the Galactic CV population and of close binary evolution more generally. We will also measure the wavelength-dependence of the WD pulsation amplitudes in J1507 and determine high precision binary parameters based on a combination of spectroscopic modelling and eclipse analysis. As a result, J1507 will become the benchmark for theoretical studies of CV evolution and the first proper calibrator for models of pulsations in accreting WDs.;
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