Studying the line spectra produced by hot gases and absorbed by cooler gases allows us to identify the elements in stars. When a gas is very hot, it doesn’t emit all wavelengths of light.
As a result each produces photons with different energy and so the line spectra for different elements will be different. This means that line spectra can be used to identify elements. Continuous ...
Abstract: We present the results of a radial-velocity study of 10 spectroscopic binaries with composite spectra that were observed at Observatoire ... We computed their orbital elements for the first ...