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Duplicity in Hubble Space Telescope Guide Stars: Fine Guidance Sensor Serendipitous Survey Results
Data from the Hubble Space Telescope (HST) Fine Guidance Sensor (FGS)interferometers, covering 22 months of guide-star acquisitionoperations, have been analyzed for evidence of stellar duplicity. Thedata comprise a survey of observed guide stars, all of which are takenfrom the HST Guide Star Catalog, ranging in magnitude from 9 to 14. Thesurvey results cover a parameter space for the newly found doubles, forthe fainter stars, which are of smaller limiting angular separationsthan in any previous surveys. The normal HST engineering telemetry datafrom 13,979 acquisitions on 4882 stars have been processed. The FGSguidance data can reveal duplicity with separations ranging fromapproximately 30 mas, for the brighter stars, with small magnitudedifferences, up to the neighborhood of 500 mas, and in some cases to1000 mas. The fraction of guide stars indicating duplicity is a functionof the statistical criteria used but is over 5% at a very high level ofconfidence. It is possible that if some of the brighter and closer pairscould be identified as nearby, then their orbital motions would be rapidenough to allow a mass and distance determination on a timescale of adecade if followed with ground-based interferometric and spectroscopicinstruments. A brief catalog of doubles is given, nearly all of whichare of certain duplicity. Information for accessing on-line catalogs oflarge numbers of stars with lesser, but nevertheless strong,probabilities of duplicity and also for the solutions for duplicity fromall acquisitions is provided.
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