| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 117, Number 2, June I 1996
|
|
|---|---|---|
| Page(s) | 335 - 342 | |
| DOI | https://doi.org/10.1051/aas:1996160 | |
| Published online | 15 June 1996 | |
Optical positions of radio emitting stars *
1
Observatório Nacional/CNPq, Brazil
2
Observatório do Valongo/UFRJ, Brazil
3
Pulkovo Observatory, Russia
Corresponding author: Send offprint request to: M. Assafin, Observatório Nacional/CNPq, R. Gal. José Cristino 77, CEP20921-400, Rio de Janeiro, Brazil e-mail: massaf@on.br
Received:
9
August
1995
Accepted:
20
November
1995
In order to contribute to the alignment of the radio and
optical reference frames, 50 stars with confirmed radio emission and
published radio positions were observed by astrographical means.
Additionally, two confirmed radio-stars of fainter magnitude were
observed using a CCD direct camera with a long focus, large aperture
telescope.
The reductions are made relative to four catalogues: the
Carlsberg Meridian Catalogue #4, the International Reference Stars
Catalogue, the Positions and Proper Motion Catalogue and the
Astrographical Catalogue of Reference Stars. The best results were
obtained with the CAMC catalogue. The plate error of a radio star position
is 0
07 for both right ascension and declination, rising
to 0
20 for
bright stars.
Ten of the program stars are not in the HIPPARCOS Input Catalogue and
12 do not belong to any of the major reference catalogues used. As soon
as the HIPPARCOS results become available, its reference stars already
measured in the plates will enable us to get positions for those 10
radio stars in the HIPPARCOS system.
Key words: astrometry / radio continuum: stars / reference systems
© European Southern Observatory (ESO), 1996