Comparison of precise optical and radio positions for CYG OB2 members and P CYG

Details Comparison of precise optical and radio positions for CYG OB2 members and P CYG Comparison of precise optical and radio positions for CYG OB2 members and P CYG

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109..282d&link_type=abstract

Astronomy and Astrophysics, vol. 109, no. 2, May 1982, p. 282-284. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astronomy

7

Astrometry, Light (Visible Radiation), Radio Spectra, Radio Stars, Stellar Motions, Stellar Spectra, Position (Location), Spaceborne Astronomy

Scientific paper

Precise optical positions and proper motions in the FK4 system have been determined for four recently detected radio stars in the Cyg OB2 association and the known radio star P Cyg. A comparison with the VLA positions from Abbott et al. (1982) shows an excellent agreement of both declination systems in that sky region, whereas a constant R.A. zero point difference of -9 ms probably is present. The importance of determining precise radio positions of the Hipparcos astrometry satellite project is stressed.

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