Constant-Velocity Stars at the North Galactic Pole Suitable for Use as Secondary Velocity Standards We present mean radial velocities for 143 stars in Selected Area 57 atthe north Galactic pole that are suitable for use as secondary velocitystandards. The stars were drawn from a magnitude-limited sample and aremostly fainter than 11th magnitude in V. They span a wide range ofeffective temperatures and surface gravities and thus provide a suitablesource of targets for observed templates. The mean radial velocities arebased on at least 10 observations spanning at least 8200 days, and areaccurate typically to 0.2 km s-1, with no obvious signs ofvariable velocity or composite spectra.Some of the results presented here used observations made with the MMT,a joint facility of the Smithsonian Institution and the University ofArizona.
A search for wide binaries at the north galactic pole using precise radial velocities Precise radial velocities are presented from a survey of 247 starscentered on Selected Area 57 at the North Galactic Pole, complete forlate-type stars with V magnitude brighter than 12.0. The radialvelocities have a typical precision of 0.2-0.3 km/s. New spectral typesand distances estimates are presented for 120 of the stars in thesample. All pairs of stars with angular separations between 1 and 600arcsec have been considered, and 11 candidate pairs found with velocitydifferences less than 1.5 km/s. It is estimated that 4 or 5 of the 11candidate pairs are actually bound binaries, but none with separationslarger than 0.1 pc. The constraints imposed by these results on theactual distribution of wide binaries in the Galaxy should now bereanalyzed. The unusual precision of the velocities led to the discoveryof a new cluster associated with the multiple system ADS 8811 ABC.
Photoelectric V and (B-V) for Weistrop stars near the north Galactic pole V and (B-V) have been obtained for 173 stars near the north Galacticpole. A comparison is made between these photoelectric values and thephotographic values obtained by Weistrop (1972). Corrections have beenderived which, when applied to (B-V)w and Vw, result in relativelysystematic error-free colors and magnitudes.
