Other
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dda....31.1206m&link_type=abstract
American Astronomical Society, DDA Meeting #31, #12.06; Bulletin of the American Astronomical Society, Vol. 32, p.868
Other
Scientific paper
In Kyoto, the International Astronomical Union passed resolution B2 which made the Hipparcos Catalogue the optical realization of the International Celestial Reference Frame. This resolution does not differentiate between the different types of stars in Hipparcos; the catalogue in its entirety currently represents the ICRF at optical wavelengths. The astrometric community now realizes that not all stars in Hipparcos are equivalent. This is especially true in the cases of double stars whose proper motions contain the effects of uncorrected orbital motion. Using the proper motions recently derived at the USNO for the Tycho-2 Catalogue, comparisons are made with the values in Hipparcos. The Tycho-2 data have the advantage of being based on catalog positions spanning almost a century thus averaging out effects of orbital motion in many systems. These comparisons provide the basis to illustrate the characteristics of the double stars and other so-called problem stars. A brief review of the Tycho-2 Catalogue is presented and the suitability of the Hipparcos double and problem stars to represent the ICRF at optical wavelengths is discussed.
Corbin Thomas E.
Mason Brian D.
Urban Sean E.
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