"Version: 20250701"--Title page verso.Includes bibliographical references (pages 11-1-11-4).1. Story of an evolving low mass star : foreword -- 2. Pre main sequence--PMS -- 2.1. Hayashi track -- 2.2. Mean stellar temperature during gravitational contraction -- 2.3. Duration of the PMS phase -- 2.4. List of questions3. Core hydrogen burning -- 3.1. Minimum mass for nuclear burning -- 3.2. Onset …