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

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

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

Proceedings of the 97th Colloquium of the International Astronomical Union, held in Brussels, Belgium, June 8-13, 1987