The Distances to AM CVn stars

Details The Distances to AM CVn stars The Distances to AM CVn stars

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9348g&link_type=abstract

HST Proposal ID #9348

Physics

Hst Proposal Id #9348 Hot Stars

Scientific paper

We propose to determine the parallaxes and proper motions of the five brightest of the seven known AM CVn systems using the HST Fine Guidance Sensors. AM CVn systems are binaries where mass is transferred from a completely hydrogen-deficient, degenerate mass donor to a white dwarf primary through a helium accretion disk. A better understanding of these systems is crucial for a number of reasons:, o to study the late stages of binary evolution;, o to study the effect of chemical composition on the physics of accretion discs; , o to estimate their contribution to the Supernovae Ia rate and , o to estimate their contribution to the gravitational radiation background. All these studies rely critically on a determination of the distances to the currently known systems. With brightnesses in the range 13

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