Statistics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dda....31.1401m&link_type=abstract
American Astronomical Society, DDA Meeting #31, #14.01; Bulletin of the American Astronomical Society, Vol. 32, p.869
Statistics
Scientific paper
The Tycho-2 Catalogue (Høg et al. 2000) provides astrometric and photometric information for 2.5 million stars. While within the Tycho-2 Catalogue there is no separate listing of double star parameters, there is a wealth of double star data. For all measured double star systems, each component have their own entry in Tycho-2 (i.e., this corresponds to the Hipparcos ``double entry systems") and the classical double star parameters of separation, position angle and magnitude difference can be calculated for these systems. Most double stars within the Tycho-2 Catalogue are identified with a code indicating a double, failed double or photocentric solution. These resulted in 6,251 measures of known double stars and 1,234 new double star systems [designated in the Washington Double Star (WDS) catalog with a ``TDS" discovery code]. In an effort to provide additional confirmation for uncertain pairs in the WDS, systems having fewer than three measures were compared in position and magnitude against stars in the Tycho-2 Catalogue. Unexpectedly, 4,726 systems indicated as ``single" in the Tycho-2 Catalogue not only matched one component of a WDS pair but had a nearby star which closely approximated the position and magnitude of the other WDS component. Also, these inspections resulted in 2,757 systems with a photocentric solution which, despite not being a resolved measure, tends to support the veracity of those systems. In addition, 5,330 WDS systems were seen as single in Tycho-2. The observational statistics of these various classes of objects are presented as well as catalog statistics for those with single star or photocenter solutions. A quantitative assessment of Tycho-2 double star measures is provided via a comparison of Tycho-2 O-C residuals to known orbits. Finally, some new TDS stars have been verified via speckle interferometry using the 82-inch telescope of McDonald Observatory. These results are presented here also.
Hartkopf William I.
Holdenried Ellis R.
Makarov Valeri V.
Mason Brian D.
Urban Sean E.
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