1 Introduction

The photoelectric astrolabe Mark II (PA II) was made at Nanjing Astronomical Instrument Factory in 1974 and was put into operation since Mar. 1976 (Luo 1979). The aperture of object mirror is 200 mm and the equivalent focal length is 2400 mm. The zenith distance observed is 30$^{\circ}$.

Before modernization, the astrolabe was a semi-automatic instrument with a limiting magnitude of only 7.0. Since 1987, the astronomers of the Beijing Astronomical Observatory began to improve the instrument. Automatic observation with the instrument started in 1988. A new method of photon-counting was used for data processing in 1990. And the limiting magnitude is increased to 11.5.

Using the data observed with the instruments from 1976 to 1991, several general catalogues (Zhu et al. 1981; Working Group of GCPA, 1983; Working Group of CGSC, 1991; Lu 1991) of stars had been compiled.

In 1992, the instrument was moved and installed at the San Juan Observatory (OAFA) in Argentina for observations of the catalogue of stars in the southern hemisphere.

Radio stars are suitable intermediaries for linking optical stellar reference frames to the quasi-inertial radio reference frame represented by compact extragalactic radio sources. From Feb. 1992 to Mar. 1997, we observed radio stars with the photoelectric astrolabe using the list provided by H.G. Walter at Astronomishes Rechen-Institut, Heidelbery (Walter 1990).

In 1996, we presented the preliminary results (Lu et al. 1996). In this paper we submit all results observed from Feb. 1992 to Mar. 1997. The positions of these radio stars are fixed for epoch of observation and the equinox J2000.0 and in system close to that of the FK5.