Observations of radio stars at the Valinhos CCD Meridian Circle

Details Observations of radio stars at the Valinhos CCD Meridian Circle Observations of radio stars at the Valinhos CCD Meridian Circle

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..136..531l&link_type=abstract

Astronomy and Astrophysics Supplement, v.136, p.531-537

Astronomy and Astrophysics

Astrophysics

1

Astrometry, Reference Systems, Radio Stars

Scientific paper

We present the astrometric results from the optical observation of 16 stars from the list of \cite[Wendker (1995)]{wend95}, with detected or suspected radio emission. The results are given on the Hipparcos/Tycho reference frame. The stars are evenly distributed in right ascension and the declinations range from -15.6(deg) to +28.6(deg) . This distribution, also allowed to obtain positions relative to the Twin Astrographic Catalogue (TAC 1.0). The observations were carried out with the Valinhos CCD Meridian Circle, in Brazil, operating in drift scanning mode. The average positional precision is at 40 mas and generally below 2 mas/yr for proper motions, obtained with the new reductions of the Astrographic Catalogue - AC2000, as first epoch. In the strips taken from the observation of the 16 radio stars, 573 Tycho stars, 545 ACT stars and 566 TAC stars were found. The analysis of the independent reductions made relatively to those frames and the large number of common stars enables to focus on the equatorial zone, as represented by the three catalogues. As a result, the quality of Valinhos observations with regard to ACT and TAC internal accuracies is verified. Table 1 of this paper, plus 16 additional tables with observed positions for the ACT reference stars, are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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