Mark III very long baseline interferometry positions of eight stellar systems and astrometric comparisons

Details Mark III very long baseline interferometry positions of eight stellar systems and astrometric comparisons Mark III very long baseline interferometry positions of eight stellar systems and astrometric comparisons

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1746l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Nov. 1988, p. 1746-1754.

Astronomy and Astrophysics

Astronomy

20

Astrometry, Stellar Systems, Very Large Array (Vla), Very Long Base Interferometry, Error Analysis, Extragalactic Radio Sources, Position (Location), Radio Stars, Signal To Noise Ratios

Scientific paper

Accurate positions of eight stellar systems are derived from Mark III VLBI observations conducted with multistation arrays. These radio positions are referred to the VLBI extragalactic reference frame of equinox and equator J2000.0. The estimated precision of the best position is 2 mas and was obtained during a relatively strong radio outburst of the RS CVn stellar system HR 5110. This precision is appropriate to link the future HIPPARCOS optical reference frame to the extragalactic VLBI frame. Typically, the astrometric precision is ≡0arcsec.01 and is essentially limited by the signal-to-noise ratio of the VLBI data. Comparisons of the authors' VLBI positions to VLA and optical FK4-based positions of these stars are presented in the J2000.0 system. The agreement between the VLBI and optical positions is satisfactory (0arcsec.05 on average) and interpreted as demonstrating that the preliminary optical FK5 frame defined by Fricke (1982) is aligned with the VLBI extragalactic reference frame at that level.

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