Spectrum of the 8th-magnitude wolf-rayet star wr 135 in cygnus. From its beginnings in the early 19th century, spectroscopy the analysis of starlight by wavelength has unlocked a treasure-trove of astronomical information. Most of what we know about a stars chemical composition, temperature, axial. So what is spectroscopy, and what do the amateur astronomers get up to? Absorption spectroscopy is the study of the color and light spectrum of stars and galaxies. This post is more than 60 days old and may no longer be the most up-to-date content. For event related posts, please check for a newer article to avoid confusion on times and locations. Practical amateur spectroscopy, tonkin (ed), covers use of various instruments, from simple to sophisticated, plus some introductory theory. This is a very good book for getting started, and in many ways this brief article is a tickler to get you to read this book or 2. Spectroscopy is a huge subject with innumerable specialist targets even for the amateur. As the only current book on amateur spectroscopy it must be recommended. (maurice gavin, journal of the british astronomical association, vol.). Welcome to the caos web site! Caos c lub of a ficionados in o ptical s pectroscopy. Our purposes are search and develop know-how in the construction of spectrographs aimed to amateur astronomers. Above is the spectrum obtained using the color camera, on vega. Its pretty amazing to see the alignment of three hydrogen absorption lines alpha, at 656nm, beta at 486nm, and gamma at 434nm, all lined up with the stellar spectrum. Stellar spectroscopy has opened up a whole new area of astronomy for me. Some good resources for the beginner to advanced amateur looking to do spectroscopy at a pro-am level. Boyds scientific analysis of amateur spectra gives a good overview of the complete process to produce research quality spectra.