This book, Practical guide for (good) beginners in astronomical spectroscopy, by François Cochard (co-founder of the company Shelyak Instruments and active amateur astronomer), is written in French. The preface is by Claude CATALA, President of the Paris Observatory.
Astronomical spectroscopy has experienced strong development in recent years, and more and more amateur astronomers are embarking on the adventure. Obtaining a star spectrum is nowadays very accessible with modest equipment - provided you put a little method and go step by step.
This book is presented as a guide and is intended to be very practical. There is plenty of room for common sense. It covers all the aspects necessary to guide you towards fast and quality observations with a slit spectroscope. We speak (necessarily) of astrophysics and optics, but it is neither an astrophysics course nor an optics course and no prerequisites are necessary.
A large part of the book is devoted to preparing the instrument and observing in the field because it is often at this stage that novice observers encounter the most difficulty with the installation of several pieces of equipment ( telescope, spectroscope, camera…).
Little by little, you will learn to get your first spectra, to reduce the data, then to look at them with more and more demand, to finally realize that you are making physical measurements.