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horizontal branch

horizontal branch
The horizontal branch is the part of the Hertzsprung-Russell diagram of occupied by the stars in a typical globular cluster. It contains stars with masses of 0.6 to 0.8 solar masses that are hotter and fainter than those on the giant branch. A star appears on the horizontal branch after it has undergone its helium flash and begun to burn helium steadily in its core and hydrogen in a surrounding envelope.

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