Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279..267d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 1, p. 267-272
Astronomy and Astrophysics
Astronomy
13
Astrometry, Astronomical Maps, Astronomical Photography, Bl Lacertae Objects, Celestial Reference Systems, Image Classification, Image Processing, Optical Data Processing, Stellar Motions, Astronomical Satellites, Hipparcos Satellite, Normal Density Functions, Photographic Plates, Spaceborne Astronomy
Scientific paper
This study for the first time investigates the possibility of deriving astrometric positions for bright stars on Carte du Ciel (CdC) plates, whose triple images are not separable. The field from the Bonn Hipparcos Extragalactic Link Programme with the BL Lac object OJ 287 has been selected. The triple images on the CdC plate were modeled by three overlapping elliptical Gaussians. A strong photographic adjacency effect was found increasing the distances between the three images for each star from about 140 micrometers for faint stars to more than 300 micrometers for the brightest stars. However, due to the symmetric arrangement of the three images their center of gravity allows to derive a usable astrometric position. In addition to the CdC plate from the Paris zone taken in 1903 twelve plates from four different telescopes with epochs from 1926 to 1980 were used. The rms errors of the derived proper motions for Hipparcos stars are of the order of 1-2 mas/a, i.e. similar to the errors expected from Hipparcos.
Brosche Peter
Dick Wolfgan R.
Galas Roman
Geffert Michael
Guibert Jean
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