Preliminary Version of the Third Catalogue of Nearby Stars Wilhelm Gliese and Hartmut Jahreiss Astronomisches Rechen-Institut Heidelberg, Germany The present version of the CNS3 contains all known stars within 25 parsecs of the Sun. It depends mainly on a preliminary version (Spring 1989) of the new General Catalogue of Trigonometric Parallaxes (YPC) prepared by Dr. William F. van Altena (Yale University). The catalogue contains every star with trigonometric parallax greater than or equal to 0.0390 arcsec, even though it may be evident from photometry or for other reasons that the star has a larger distance. For red dwarf stars, new color-magnitude calibrations for broad-band colors were carried out and applied. For white dwarfs, the recipes of McCook and Sion in ApJS, 65, 603 (1987) were applied. Stroemgren photometry was used (not yet systematically) for early-type stars and for late dwarfs, the latter supplied by E. H. Olsen from Copenhagen Observatory (private communication). Contrary to the CNS2 (Gliese 1969) trigonometric parallaxes and photometric or spectroscopic parallaxes were not combined. The resulting parallax in the present version is always the trigonometric parallax -- if the relative error of the trigonometric parallax is smaller than 14 percent. The resulting parallax is the photometric or spectroscopic parallax only if no trigonometric parallax is available or if the standard error of the trigonometric parallax is considerably larger. Catalogue Description Column 1 - 8 Identifier col. 1,2 : Gl Gliese: CNS2, Veroeff. ARI Nr. 22 (1969) GJ Gliese & Jahreiss, A&AS, 38, 423 (1979) Wo Woolley et al., Roy. Obs. Ann. No. 5 (1970) NN newly added stars (not yet numbered) 9 - 10 Components (A,B,C,... ) 11 Reliability of the distance s: trig. parallax > 0.0390 and phot. parallax < 0.0390 x: trig. parallax > 0.0390 and phot. parallax < 0.0190 p: trig. parallax < 0.0390 and phot. parallax > 0.0390 q: trig. parallax < 0.0390 and phot. parallax(:) > 0.0390 13 - 20 Right ascension (B1950.0) 22 - 29 Declination (B1950.0) 31 - 36 Total proper motion (arcseconds per year) 38 - 42 Direction angle of proper motion 44 - 49 Radial velocity (km/sec) 51 - 53 Remark - var variable (?) radial velocity SB? suspected spectroscopic binary SB spectroscopic binary 55 - 66 Spectral type or color class 67 Selected sources - K Kuiper Type (see ApJS, 59, 197, 1985) L San-Gak Lee (AJ 89, 702, 1984) O objective prism MK type (but not Michigan type) R Robertson type (AJ, 89, 1229, 1984) s Stephenson type (AJ, 91, 144, 1985 and AJ, 92, 139, 1986) S Smethells type (IAU Coll. No 76, p. 421, 1983) U Upgren et al. (AJ, 77, 486, 1972) W Mount Wilson type 68 - 73 Apparent magnitude 74 Code - P photographic * photometric c calculated or transformed v variable : uncertain 75 J : joint magnitude 76 - 80 B-V color 81 Code - * photographic c calculated : uncertain 82 J : joint color 83 - 87 U-B color 88 Code - c calculated C from 'Cape refractor system' : uncertain 89 J : joint color 90 - 94 R-I color (Kron's system) 95 Code - C in Cousins' system t transformed from another system : uncertain 96 J : joint color 97 - 101 Trigonometric parallax (F5.4) 102 - 105 Standard error of trig. parallax (F4.4) 107 - 111 Resulting parallax (F5.4) 112 - 115 Standard error of res. parallax (F4.4) 116 Code - r parallax from spectral types and broad-band colors w photom. parallax for white dwarfs s photom. parallax from Stroemgren photometry o photom. parallax from Stroemgren photometry calculated by E. H. Olsen p photom. parallax from other colors 118 - 122 Absolute visual magnitude, M(V) 123 Code, copied from col. 74 124 Code, copied from col. 75 125 Quality of absolute magnitude a s.e. < 0.10 mag b 0.11 < s.e. < 0.20 c 0.21 < s.e. < 0.30 d 0.31 < s.e. < 0.50 e 0.51 < s.e. < 0.75 f 0.76 < s.e. 128 - 131 U space velocity component in the galactic plane and directed to the galactic center 133 - 136 V space velocity component in the galactic plane and in the direction of galactic rotation 138 - 141 W space velocity component perpendicular to the plane and in the direction of the north galactic pole 143 - 148 HD number 150 - 160 Durchmusterung number BD : Bonner Durchmusterung CD : Cordoba Durchmusterung CP : Cape Photographic Durchmusterung 162 - 170 Giclas number 172 - 176 LHS number 178 - 182 Number according to code in col. 179 V : Vyssotsky number U : UGPMF number (see AJ, 77, 486, 1972) W : white dwarf (EG or Gr number) 184 - 252 Additional identifications (LTT, LFT, Wolf, Ross, etc.) and remarks Description prepared by Hartmut Jahreiss, Astronomisches Rechen-Institut, Moenchhofstrasse 12-14, D-6900 Heidelberg 1, GERMANY.