Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002msngr.108...26h&link_type=abstract
The Messenger, No. 108, p. 26 - 29 (June 2002)
Astronomy and Astrophysics
Astronomy
1
Globular Clusters, Cn
Scientific paper
Globular clusters (GCs) have long had an appeal to astronomers as laboratories for studying stellar evolution. Part of their attraction arises not only from the vast number of stars that they contain, but also from the common properties that stars within a cluster are often thought to share. For example, in one standard text book (Carrol & Ostlie 1996) we find: “Every member of a given (star) cluster is formed from the same cloud, at the same time, and all with essentially identical compositions.” Despite this paradigm, it has been known for 30 years that the element abundances among stars in a given GC can vary significantly. Globular clusters are the oldest star clusters known with ages on the order of the age of the universe. The chemical abundance pattern among their stars is therefore an important clue to the first substantial production of heavy elements by massive stars in the early universe. Understanding the origin of the chemical inhomogeneity of GCs is therefore of interest for cosmology as well as stellar evolution.
Grebel Eva Katharina
Harbeck Daniel
Smith Graeme H.
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