A search for wide binaries at the north galactic pole using precise radial velocities

Details A search for wide binaries at the north galactic pole using precise radial velocities A search for wide binaries at the north galactic pole using precise radial velocities

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..625l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Feb. 1991, p. 625-636. Research supported by U.S. - Israel Binational Science F

Astronomy and Astrophysics

Astronomy

13

Binary Stars, Late Stars, Milky Way Galaxy, Radial Velocity, Sky Surveys (Astronomy), Northern Sky, Position (Location), Stellar Magnitude, Stellar Spectrophotometry

Scientific paper

Precise radial velocities are presented from a survey of 247 stars centered on Selected Area 57 at the North Galactic Pole, complete for late-type stars with V magnitude brighter than 12.0. The radial velocities have a typical precision of 0.2-0.3 km/s. New spectral types and distances estimates are presented for 120 of the stars in the sample. All pairs of stars with angular separations between 1 and 600 arcsec have been considered, and 11 candidate pairs found with velocity differences less than 1.5 km/s. It is estimated that 4 or 5 of the 11 candidate pairs are actually bound binaries, but none with separations larger than 0.1 pc. The constraints imposed by these results on the actual distribution of wide binaries in the Galaxy should now be reanalyzed. The unusual precision of the velocities led to the discovery of a new cluster associated with the multiple system ADS 8811 ABC.

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