"Version: 20200701"--Title page verso.Includes bibliographical references.part I. Essentials. 1. Basic properties of stars and the stellar plasma -- 1.1. Introduction -- 1.2. Blackbody radiation and luminosity -- 1.3. Abundances and mass fractions -- 1.4. Further thermodynamic relations -- 1.5. Equations-of-state for stellar plasmas -- 1.6. Basics of scattering -- 1.7. Spin, parity, and selecti…