Halo star abundances and r-process synthesis
نویسندگان
چکیده
منابع مشابه
Halo Star Abundances and r-Process Synthesis
The heavy elements formed by neutron capture processes have an interesting history from which we can extract useful clues to and constraints upon the star formation and nucleosynthesis history of Galactic matter. Of particular interest are the heavy element compositions of extremely metal-deficient stars. At metallicities [Fe/H] ≤ -2.5, stellar abundance data (for both halo field stars and glob...
متن کاملHalo Star Abundances and Heavy Element Nucleosynthesis
Abundance observations of neutron-capture elements in halo stars are providing a wealth of new information on the nature of heavy element nucleosynthesis in evolved stars. In particular these observations provide clues and constraints to the synthesis mechanisms for the n-capture elements, suggestions for the site (or sites) for the r-process and Galactic chemical evolution. We have been obtain...
متن کاملr-Process Enhanced Halo Stars
Abundance observations indicate the presence of rapid-neutron capture (i.e., r-process) elements in old Galactic halo and globular cluster stars. These observations provide insight into the nature of the earliest generations of stars in the Galaxy – the progenitors of the halo stars – responsible for neutron-capture synthesis of the heavy elements. The large star-to-star scatter observed in the...
متن کاملR-process Pattern in the Very-metal-poor Halo Star Cs 31082-001
The very-metal-poor halo star CS 31082-001 was discovered to be very strongly r-process-enhanced during the course of a VLT+UVES high-resolution follow-up of metal-poor stars identified in the HK survey of Beers & colleagues. Both the strong n-capture element enhancement and the low carbon and nitrogen content of the star (reducing the CN molecular band contamination) led to the first U abundan...
متن کاملBeryllium abundances and star formation in the halo and in the thick disk
Context. Beryllium is a pure product of cosmic ray spallation. This implies a relatively simple evolution in time of the beryllium abundance and suggests its use as a time-like observable. Aims. Our goal is to derive abundances of Be in a sample of 90 stars, the largest sample of halo and thick disk stars analyzed to date. We study the evolution of Be in the early Galaxy and its dependence on k...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 2001
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(01)00722-9