Binary systems of stars are as common as single stars. Stars evolve primarily by nuclear reactions in their interiors, but a star with a binary companion can al

An advanced review of how binary stars affect stellar evolution, presenting results from state-of-the art models and recent observations.

In 1988, in an article on the analysis of the measurements of the variations in the radial velocities of a number of stars, Campbell, Walker, and Yang reported

Binary and Multiple Systems of Stars focuses on spectroscopic observational results and interpretations of binaries, and a few of multiple systems. Organized in

Written specially for practical amateur astronomers who not only want to observe, but want to know and understand the details of exactly what they are looking a