My book, Lectures on Spectral-Line Analysis: F, G, and K Stars, is a graduate-student level monograph dealing with the analysis of stellar spectra.
Topics include:
-Major line broadeners
-Fourier analysis of line profiles
-Stellar turbulence
-Stellar granulation
-Stellar rotation
-Magnetic activity
-Stellar surface features
Published in 1988, the ideas and concepts remain valuable for scientific investigation.