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HK: Physik der Hadronen und Kerne

HK 28: Nuclear and Particle Astrophysics I

HK 28.3: Talk

Wednesday, March 10, 2004, 11:30–11:45, F

Isotopic abundance ratios in ultra-metal-poor Halo stars — •Bernd Pfeiffer, Khalil Farouqi, and Karl-Ludwig Kratz — Inst. f. Kernchemie, Mainz, Germany

So far, optical spectroscopy of Halo stars yielded mostly elemental abundances. With this the separation of the individual contributions of the 2 neutron-capture processes (s- and r-process) is not unambiguous. Recently, isotopic abundances of some rare-earth elements have been measured [1].

We calculate isotopic abundance ratios for Ba, La and Eu within the classical r-process approach and the high-entropy wind SNII scenario for different stellar conditions. Comparing our results with observations, the stellar evolution of s- and r-process nucleosynthesis in the early Galaxy can be studied.

[1] C. Sneden et al., APJ 526, L25 (2002); D.L. Lambert et al., MNRAS 335, 325 (2002)