An Insight into the Reaction Rates of the Ne-Na and Mg-Al Chains from the Abundance Anomalies in Globular Cluster Red Giants

Details An Insight into the Reaction Rates of the Ne-Na and Mg-Al Chains from the Abundance Anomalies in Globular Cluster Red Giants An Insight into the Reaction Rates of the Ne-Na and Mg-Al Chains from the Abundance Anomalies in Globular Cluster Red Giants

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...608..983a&link_type=abstract

The Astrophysical Journal, Volume 608, Issue 2, pp. 983-988.

Astronomy and Astrophysics

Astronomy

5

Galaxy: Globular Clusters: General, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Abundances, Stars: Evolution

Scientific paper

The Na, Mg, and Al abundance anomalies that have been observed in globular cluster red giants are hard to understand in terms of standard evolutionary scenarios, especially with regard to the depletion of 24Mg. In previous papers, we have proposed a flash-assisted deep-mixing model that can burn 24Mg and help explain the observed abundance anomalies. Relevant reaction rates have considerable uncertainties at low energies. Using NACRE reaction rates, we recompute the nucleosynthesis predicted by our model and, by adjusting reaction rates within current uncertainties, find that agreement with the observations is considerably improved for almost all isotopes except for 25Mg, which remains overabundant. A resolution of the latter discrepancy by nuclear physics alone would require that the 25Mg(p,γ)26Al reaction rate be substantially larger than that given by the experiments. This suggests that our model may require burning of 25Mg (coupled with some extra mixing) during quiescent hydrogen-burning phases.

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