Astrophysics and Space Science

, Volume 2, Issue 3, pp 310–314

On the evolution of the Horizontal Branch stars of metal-poor Globular Clusters

  • V. Castellani
  • A. Renzini

DOI: 10.1007/BF00650907

Cite this article as:
Castellani, V. & Renzini, A. Astrophys Space Sci (1968) 2: 310. doi:10.1007/BF00650907


The actual knowledge on Horizontal Branch stars of the metal-poor Globular Clusters of our Galaxy suggests that these stars evolve along the Horizontal Branch from the very blue stars towards lower effective temperature.

From this behaviour it follows that a substantial mass loss occurs at the He-flash. On the basis of a gravitational thermalization of Horizontal Branch stars any recent observational data concerning NGC 7006 are re-examined. It is pointed out that today it is not necessary to leave the hypothesis of a strong correlation between the metal and helium content for our Galaxy.

Copyright information

© D. Reidel Publishing Company 1968

Authors and Affiliations

  • V. Castellani
    • 1
  • A. Renzini
    • 1
  1. 1.Laboratorio di Astrofisica dell' Università di RomaFrascati (Roma)Italy