Stellar atmospheres : $b A contribution to the observational study of high temperature in the reversing layers of stars

This volume offers a thorough exploration of stellar atmospheres, drawing on the latest laboratory physics to illuminate how hot gases imprint their signatures on starlight. Beginning with the fundamental properties of matter—electron arrangements, atomic potentials, and the effects of temperature and pressure—it builds a bridge between terrestrial experiments and the distant glow of suns and giants. The author systematically develops a temperature scale for stars, compares giants to dwarfs, and shows how subtle shifts in spectral lines reveal the pressures shaping the outer layers.

The second part turns to the theory of thermal ionization, presenting the high‑temperature absorption spectra that dominate the “reversing layer” of a star’s atmosphere. Detailed discussions of ionization formulas, laboratory confirmations, and the identification of elemental lines provide a clear guide for astronomers and physicists alike. Though rooted in early twentieth‑century research, the work remains a concise reference for anyone interested in the physical foundations of how stars reveal themselves through their spectra.