The Ages of Stars: The Horizontal Branch
arXiv:0811.2947 · doi:10.1017/S174392130903186X
Abstract
Horizontal branch (HB) stars play a particularly important role in the "age debate," since they are at the very center of the long-standing "second parameter" problem. In this review, I discuss some recent progress in our understanding of the nature and origin of HB stars.
10 pages, 8 figures. Invited review, to appear in "The Ages of Stars", proceedings of IAU Symp. 258