The spectroscopic binaries in NGC 6475

Details The spectroscopic binaries in NGC 6475 The spectroscopic binaries in NGC 6475

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60....9g&link_type=abstract

Astronomy and Astrophysics, vol. 60, no. 1, Aug. 1977, p. 9-12.

Astronomy and Astrophysics

Astrophysics

16

Binary Stars, Radial Velocity, Star Clusters, Velocity Measurement, A Stars, B Stars, Orbital Elements, Stellar Evolution

Scientific paper

Using objective-prism spectra obtained with a radial-velocity astrograph, a large number of radial velocities of 13 of the brightest members in NGC 6475 have been determined. Three of five previously suspected short-period spectroscopic binaries could not be confirmed. However, two of these three stars seem to be long-period spectroscopic binaries. The remaining two suspected binaries could be confirmed, and elements have been derived. It is concluded that the frequency of short-period spectroscopic binaries in NGC 6475 is considerably smaller than supposed earlier. Finally, general properties of the technique employed for the determination of relative radial velocities are discussed.

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