Michel Henon's first research article: An improved calculation of the perturbation of stellar velocities

TL;DR

Michel Henon's first research article addresses the divergence problem in dynamical friction calculations, proposing a solution that contributed to understanding it as a non-local, transitory force affecting stellar velocities.

Contribution

Henon introduces an improved method to calculate stellar velocity perturbations, resolving divergence issues and advancing the theoretical understanding of dynamical friction.

Findings

Resolved divergence in dynamical friction calculations

Established non-local, transitory nature of dynamical friction

Laid foundation for modern dynamical friction theory

Abstract

Fifteen years after the discovery of dynamical friction by Chandrasekhar, Michel Henon attempts to solve the longstanding problem of the divergence of the friction suffered by the perturber and caused by the most distant cluster stars. His solution laid the foundation to the current understanding of dynamical friction as a non-local transitory force.