Volume 2 contains the basic physical ideas and laws used in the study of the outer layers of a star including stellar magnitudes, spectra and temperatures, radiative transfer in a stellar atmosphere, line formation, the spectrum of hydrogen, spectral analysis, and available structural components.Volume 2 contains the basic physical ideas and laws used in the study of the outer layers of a star including stellar magnitudes, spectra and temperatures, radiative transfer in a stellar atmosphere, line formation, the spectrum of hydrogen, spectral analysis, and available structural components.Volume 2 contains the basic physical ideas and laws used in the study of the outer layers of a star including stellar magnitudes, spectra and temperatures, radiative transfer in a stellar atmosphere, line formation, the spectrum of hydrogen, spectral analysis, and available structural components.Preface; 1. Stellar magnitudes and stellar colors; 2. Stellar spectra; 3. Temperature estimates for stars; 4. Basics about radiative transfer; 5. Radiative transfer in stellar atmosphere; 6. The depth dependence of the source function; 7. The continuous absorption coefficient; 8. The influence of the non-greyness of the absorption coefficient; 9. The pressure stratification; 10. Theory of line formation; 11. The hydrogen lines; 12. Spectrum analysis; 13. Basics about non-local thermodynamics equilibrium; 14. The hydrogen convection zone; 15. Stellar chromospheres, transition layers, and coronae; 16. Stellar winds; Problems; References; Index. ...an excellent introduction to analytical methods and comparison with observations. Virginia Trimble, Comments on Astrophysics