This page shows the spectra of three highly evolved stars, including a white dwarf star, characterized by extremely broad hydrogen lines, due to the very high gravities in the atmospheres of these degenerate stars, a blue horizontal branch star, which is a star that has already evolved through the red-giant stage and is now burning helium in its core, and a so-called "Above the horizontal-branch star", which has apparently exhausted helium in its core, and is now once again evolving to the red giant branch. This star is a member of M13, a globular cluster.
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