Rubidium-Rich Asymptotic Giant Branch Stars

Bibcode
2006Sci...314.1751G
DOI
10.1126/science.1133706
García-Hernández, D. A.; García-Lario, P.; Plez, B.; D'Antona, F.; Manchado, A.; Trigo-Rodríguez, J. M.
Bibliographical reference

Science, Volume 314, Issue 5806, pp. 1751- (2006).

Advertised on:
12
2006
Journal
Science
Number of authors
6
IAC number of authors
1
Citations
125
Refereed citations
94
Description
A long-debated issue concerning the nucleosynthesis of neutron-rich elements in asymptotic giant branch (AGB) stars is the identification of the neutron source. We report intermediate-mass (4 to 8 solar masses) AGB stars in our Galaxy that are rubidium-rich as a result of overproduction of the long-lived radioactive isotope 87Rb, as predicted theoretically 40 years ago. This finding represents direct observational evidence that the 22Ne(α,n)25Mg reaction must be the dominant neutron source in these stars. These stars challenge our understanding of the late stages of the evolution of intermediate-mass stars and would have promoted a highly variable Rb/Sr environment in the early solar nebula.
Type
Refereed

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