Computer Science
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008msngr.134s..18d&link_type=abstract
The Messenger, vol. 134 supplement, p. 18-22
Computer Science
2
Scientific paper
The majority of Globular Clusters (GC) show chemical inhomogeneities in the composition of their stars, apparently attributable to a second stellar generation in which the forming gas is enriched by hot CNO-cycled material processed in stars belonging to a first stellar generation. We review the reasons why the site of the nucleo-synthesis can be identified with hot-bottom burning in the envelopes of massive asymptotic giant branch (AGB) stars and super-AGB stars. The analysis of spectroscopic data and photometric signatures, such as the horizontal branch morphology, shows that the percentage of ‘anomalous' stars is 50 % or more in most GCs examined so far. If anomalies are the rule and not the exception, then they clearly are closely related to the dynamical way in which GCs form and survive. We show a possible solution obtained by a hydrodynamical model followed by the N-body evolution of the two stellar populations, and propose that most GCs survive thanks to the formation of the second stellar generation.
D'Antona Francesca
Ventura Paolo
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