chrHe

chrHe refers to the helium atom, specifically when it appears as a spectral line in stellar or other astronomical observations. The 'chr' prefix is a common convention in astronomical spectroscopy to denote the chemical element responsible for a spectral feature, followed by its chemical symbol. Helium, with the symbol He, is the second lightest element and is abundant in the universe, primarily formed during the Big Bang. Its spectral lines are observed when light from a star or gas cloud passes through a medium containing helium atoms. When these helium atoms absorb or emit photons at specific wavelengths, they create characteristic lines in the spectrum. The presence and strength of these chrHe lines provide valuable information about the temperature, pressure, and composition of the emitting or absorbing material. For instance, the detection of helium lines in the spectra of distant stars helped confirm its presence in their atmospheres and contributed to our understanding of stellar evolution. The study of chrHe spectral lines is a fundamental aspect of astrophysics and aids in classifying stars and analyzing the chemical makeup of celestial objects.