Hertzsprung gap

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The Hertzsprung Gap is an area on the Hertzsprung-Russell diagram in which there are very few stars. It lies above the main sequence , between the spectral classes middle A to late F. The gap is created by the short duration of stars in this area and by the necessary mass of over four solar masses , which according to the original mass function have only a few per thousand of all stars.

The Hertzsprung gap only exists for stars of Population I , since the horizontal branch is located in the case of low-metal stars in Population II instead of the gap .

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  • Helmut Scheffler, Hans Elsässer : Physics of the stars and the sun . 2nd, revised and expanded edition. BI Wissenschaftsverlag, Mannheim 1990, ISBN 3-411-14172-7 .
  • A. Unsöld, B. Baschek: The New Cosmos: Introduction to Astronomy and Astrophysics . 7th, revised and expanded edition. Springer Verlag, Berlin 2006, ISBN 3-540-42177-7 .