Statistics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dda....30.1103m&link_type=abstract
American Astronomical Society, DDA meeting #30, #11.03; Bulletin of the American Astronomical Society, Vol. 30, p.1146
Statistics
Scientific paper
An overview of Hipparcos detection of known, new, and problem double stars is presented in the regimes of Delta m and separation (rho ). Various ground-based techniques are applicable to this Delta m-rho space, and possibly the method presenting the greatest potential (Delta mv of ~ 3, mv of 10.5, and diffraction limited astrometry), for characterizing the dynamical properties of these objects is speckle interferometry. An overview of speckle work on these objects is presented. While some results have already been presented using both the CTIO 4-m and the Mt. Wilson 100-in, more is in progress including reduction of two 1997 McDonald Observatory runs, rereduction of approximately 1000 archival observations and continued work with the USNO 26-inch telescope. While conducting a separate survey at CTIO, ten new and twenty-two ``problem" binaries from the Hipparcos program were observed. Of these, four of the new and two of the ``problem" binaries were resolved. While the lack of resolution of most of the undetected new systems can be explained due to the Delta m or isoplanatic patch limits of speckle, the lack of ``problem" star detection is a bit surprising. The binary detection rate (2/22) of what should be an enriched sample is quite similar to the multiplicity fraction of a random sample of stars of this spectral type (10.3%). While these results agree with those obtained at Mt. Wilson (where only four of fifty-six Hipparcos suspect non-single objects were resolved) the two results may be the result of small number statistics and a larger sample (such as the McDonald Surveys) may give a more correct representation of these stars in the Delta m-rho space appropriate to speckle interferometry. Interferometry is the only technique which provides relative astrometric accuracy exceeding that of Hipparcos. Continued application of this method to these systems will allow the accurate characterization of their orbital properties.
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