SIMBAD references

A program for radial velocity measurements of Population II stars was started in 1988 and was carried out during six observing runs. The program includes metal-deficient stars, components of Population II visual binaries or common proper motion stars, suspected radial velocity variables and the Population II stars from the Hipparcos program. The measurements were made with the 1 meter reflector at the Maidanak Observatory in Uzbekistan. The average error of a single measurement is about 0.6 km/s, but for stars at 13 mag or for extremely metal-deficient stars the error is about 2.5 km/s. The catalog contains 621 measurements for 164 stars.