Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Science

horizontal branch




horizontal branch
The part of the Hertzsprung-Russell diagram of 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.


Related category

   • STELLAR ASTROPHYSICS