Basic reference text containing quantitative data on the behaviour of chemical elements in stars.This book summarizes the behaviour of the spectral lines of the chemical elements in stars. Despite more than a century of observational stellar spectroscopy, no easily accessible form of the data exists. With the opening of new wavelength regions, the necessity of such basic information is greater than ever.This book summarizes the behaviour of the spectral lines of the chemical elements in stars. Despite more than a century of observational stellar spectroscopy, no easily accessible form of the data exists. With the opening of new wavelength regions, the necessity of such basic information is greater than ever.This book presents a summary of our observational knowledge of the behavior of all chemical elements identified in stars. Whenever possible the behavior is described quantitatively, with the help of equivalent widths in different types of stars (e.g. dwarfs and supergiants), or different ionization stages, for both absorption and emission features. The authors also describe the behavior of isotopes, and there is a separate section on molecules in stars and circumstellar envelopes. This book will be a fundamental reference for observational astronomers and astrophysicists.Part I. Quantitative Description of Each of 80 Chemical Elements; Part II: 1. Behaviour of molecules in stars; 2. Groups of elements; 3. Chromospheres and coronas; Part III: 1. Terminology of spectral lines; 2. Selection of stars; 3. Line identification; 4. Equivalent widths; 5. Abundances; 6. Afterthoughts; Part IV: 1. Periodic Table; 2. Elements in alphabetical order of names; 3. Elements in alphabetical order of formula; 4. Elements ordered by atomic number; 5. Abundances of chemical elements; 6. Spectral type and surface gravity as a function of luminosity class. 7. Effective temperature; References; Index. ...provides stellar spectroscopists with a treasure trove of valuable data drawn fromlóS