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Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8618b&link_type=abstract
HST Proposal ID #8618
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Hst Proposal Id #8618 Hot Stars
Scientific paper
Trigonometric parallaxes of cataclysmic variable {CVs} are needed to obtain reliable information on luminosities, accretion rates, and on radii and masses of the stellar components. They are also needed to derive the space density, an important ingredient for theories of CV evolution. Photometric and spectroscopic parallaxes of CVs are notoriously uncertain because the stellar components have properties different from single field stars. Obtaining trigonometric parallaxes of CVs will allow us to understand to what extent the other methods are applicable to CVs and why they fail in certain cases. Trigonometric distances are also needed for those CVs to which the other methods can not be employed, e.g. because the secondary star, serving as a standard candle, is not detectable. In summary, trigonometric parallaxes are essential to our understanding of CVs. We propose to obtain accurate trigonometric parallaxes of three magnetic cataclysmic variables {CVs} which are among the brightest of their class, are not accessible to other methods of distance determinations, and have largely defied physical interpretation so far. We will: {1} clarify the nature of the enigmatic system EX Hya; {2} measure the radius {and thereby the mass} of the white dwarf in EF Eri, obtain tight limits on the magnitude of its {near-}degenerate secondary star, determine the mass-transfer rate supposedly driven by gravitaional radiation; and {3} decide on the nature of AH Men, one of the brightest long-period {probable} Intermediate Polars.
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