Horizontal Branch A- and B-type Stars in Globular Clusters

Details Horizontal Branch A- and B-type Stars in Globular Clusters Horizontal Branch A- and B-type Stars in Globular Clusters

2004-07-27

arxiv.org/abs/astro-ph/0407545v1

Astronomy and Astrophysics

Astrophysics

8 pages, 1 figure, style files included, Invited Lecture at IAU Symposium 224 "The A Star Puzzle"

Scientific paper

10.1017/S1743921304004806

Globular clusters offer ideal laboratories to test the predictions of stellar evolution. When doing so with spectroscopic analyses during the 1990s, however, the parameters we derived for hot horizontal branch stars deviated systematically from theoretical predictions. The parameters of cooler, A-type horizontal branch stars, on the other hand, were consistent with evolutionary theories. In 1999, two groups independently suggested that diffusion effects might cause these deviations, which we verified subsequently. I will discuss these observations and analyses and their consequences for interpreting observations of hot horizontal branch stars.

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