Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/470

Title

Abundance anomalies in NGC 6752 : are AGB stars the culprits?

Author(s)

Campbell, Simon W.;  Fenner, Yeshe;  Karakas, Amanda I.;  Lattanzio, John C.;  Gibson, Brad K.

Abstract

At the 7th Torino workshop held at the IoA, Cambridge University, in August 2004, a brief overview was given about the galactic globular cluster abundance anomalies problem, followed by a short report on our test of the popular theory that the observed abundance anomalies in the Galactic globular cluster NGC 6752 are due to `internal pollution' from intermediate mass asymptotic giant branch stars. In the test we use a chemical evolution model to track the composition of the intracluster medium over time. Custom-made stellar evolution models were calculated using the Monash/Mount Stromlo stellar structure code and the Monash nucleosynthesis code. Yields from these calculations were used as feedback in the chemical evolution model. A novelty of this study is that the stellar evolution of the second generation stars was calculated using the appropriate composition (non scaled-solar), as given by the chemical evolution model. By tracing the chemical evolution of the intracluster gas we are able to test the internal pollution scenario, in which the Na- and Al-enhanced ejecta from intermediate mass AGB stars is either accreted onto the surfaces of other stars, or goes toward forming new stars.

Publication type

Journal article

Research centre

Swinburne University of Technology. School of Biophysical Sciences and Electrical Engineering. Centre for Astrophysics and Supercomputing

Source

Memorie della Societa Astronomica Italiana, Vol. 75 (2004), pp. 735-740

Publication year

2004

Publisher

Societa Astronomica Italiana

Format

pp. 735-740

ISSN

0037-8720

Publisher URL

Memorie della Societa Astronomica Italiana

Publisher URL

http://www.sait.it/Memorie.html

Copyright

© 2004 SAIt.