Duplication in the HR Diagram
A statistical analysis of the orbital elements of spectroscopic binaries in open clusters is presented. The distribution function of initial orbital eccentricities seems to be independent of periods between 6 and 1000 days. Orbits with zero initial eccentricity do not exist. The observed distribution of the initial eccentricities is not compatible with the mechanism of binary formation through dynamical disruption of small multiple systems.
Les Etoiles Binaires Dans le Diagramme H.R
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