HIPPARCOS programme for field metal-deficient F-M stars

Abstract

Abstract. The programme contains 445 subdwarfs, metal-deficient giants, RHB and CH stars. The aim of the programme is to obtain very accurate trigonometric parallaxes (±0."002-^±0."004) and proper motions (±0."002-j-±0."004/year) for these stars, to significantly improve the determination of their positions in t lie HR diagram and to calculate accurate kinematical parameters. About half of the programme stars are measured in the Vilnius photometric system. For all stars, the colour indices B-V have been compiled or reduced from other photometric systems. 100 of the programme stars have ground-based trigonometric parallaxes. The mean parallax of these stars is +0."0347, and its mean standard error is ±0."0104. The list of the programme stars is available on magnetic diskette.