Observations of new southern spectroscopic binaries with the objective prism method

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Binary Stars, Graphs (Charts), Radial Velocity, Stellar Motions, Stellar Spectra, Astronomical Spectroscopy, Distribution Functions, Error Analysis, Statistical Analysis

Scientific paper

The occurrence of variable radial velocities in the catalog of Gieseking (1980) is investigated by a statistical analysis of the observed error frequency distribution. It is shown that the homogeneity of the observation material and the large number of observations per object allow a reliable identification of variable radial velocities. Thus, in a sample of 303 stars with spectral types between B3 and F5, a 20% frequency of variable radial velocities is found. If the radial velocity variations are assumed to be entirely due to binary motion, this result is equivalent to a 20% frequency of binary systems with separations generally less than 1 AU.

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