Rubidium-rich asymptotic giant branch stars

被引：110

作者：

Garcia-Hernandez, D. A.

Garcia-Lario, P.

Plez, B.

D'Antona, F.

Manchado, A.

Trigo-Rodriguez, J. M.

机构：

[1] European Space Agcy, ISO Data Ctr, European Space Astron Ctr, Res & Sci Support Dept, E-28080 Madrid, Spain

[2] European Space Agcy, Herschel Sci Ctr, European Space Astron Ctr, Res & Sci Support Dept, E-28080 Madrid, Spain

[3] Univ Montpellier 2, Grp Rech Astron & Astrophys Languedoc, UMR 5024, F-34095 Montpellier 5, France

[4] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy

[5] Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Tenerife, Spain

[6] CSIC, E-38200 San Cristobal la Laguna, Tenerife, Spain

[7] Fac Ciencies, Inst Space Sci, Bellaterra 08193, Spain

[8] Fac Ciencies, CSIC, Bellaterra 08193, Spain

[9] Inst Estudis Espacials Catalunya, Barcelona 08034, Spain

来源：

SCIENCE | 2006年 / 314卷 / 5806期

关键词：

D O I：

10.1126/science.1133706

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 Rb-87, as predicted theoretically 40 years ago. This finding represents direct observational evidence that the Ne-22(alpha, n)Mg-25 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.

引用

页码：1751 / 1754

页数：4

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