Effects of the s-process on Fe-group elements in meteorites

8th European Summer School on Experimental Nuclear Astrophysics (Santa Tecla School)

物理学;天文学

Trippella, O.^1,2 ; Busso, M.^1,2 ; Wasserburg, G.J.^3 ; Palmerini, S.^1,2 ; Frondini, F.^1,2 ; Petrelli, M.^1,2 ; Zucchini, A.^1,2

Department of Physics and Geology, University of Perugia, Perugia, Italy^1

Istituto Nazionale di Fisica Nucleare, Section of Perugia, Perugia, Italy^2

Lunatic Asylum, Geological and Planetary Sciences, California Institute of Technology, Pasadena, United States^3

关键词: Asymptotic giant branch;    Circumstellar;    Low-mass stars;    Macroscopic sample;    Measurements of;    Slow neutrons;    Stellar models;    Theoretical calculations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/703/1/012027/pdf
DOI  :  10.1088/1742-6596/703/1/012027

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

In the present paper we investigate the possible connection between s-process nucleosynthesis occurring during the asymptotic giant branch (AGB) phase of low-mass stars (LMS) and the isotopic anomalies of the "Fe-group" elements observed in several macroscopic samples of meteorites or in grains formed as circumstellar condensates (hereafter CIRCONs). The available measurements of chromium, iron, and nickel are well reproduced by stellar models, which account for the largest shifts in the heaviest isotopes of each element: in particular54Cr,58Fe, and64Ni. Moreover, many circumstellar condensates reflect50Ti excesses and some production of46,47,49Ti, as predicted by slow-neutron captures in AGB stars. Nevertheless, some difficulties are found in comparing theoretical calculations of s-process nucleosynthesis with calcium, silicon, and zinc isotopic anomalies.