Resolving Sirius-like binaries with the Hubble Space Telescope

(2) STScI; (3) LPL; Baltimore; Howard E. Bond (2); Jay Holberg (3) ((1) University of Leicester; Martin Barstow (1); Matt Burleigh (1); UK; University of Arizona)

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Resolving Sirius-like binaries with the Hubble Space Telescope

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arxiv astro-ph/0010181 v1 pith:DBACC3D2 submitted 2000-10-10 astro-ph

Matt Burleigh (1) , Martin Barstow (1) , Howard E. Bond (2) , Jay Holberg (3) ((1) University of Leicester , UK , (2) STScI , Baltimore , (3) LPL

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University of Arizona)

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keywords casesorbitalperiodspossiblerelationsirius-likewhiteyears

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We have imaged seventeen recently discovered Sirius-like binary systems with HST/WFPC2 and resolved the white dwarf secondary in eight cases. Most of the implied orbital periods are of order several hundred years, but in three cases (56 Per, Zeta Cygni and REJ1925-566) the periods are short enough that it may be possible to detect orbital motion within a few years. It will then be possible to derive dynamically determined masses for the white dwarfs, and potentially these stars could be used as stringent tests of the mass-radius relation and initial-final mass relation.

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