HST-STIS abundances in the uranium-rich very metal-poor star CS 31082-001
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چکیده
منابع مشابه
Abundances in the Uranium - Rich Star Cs 31082 - 001
The recent discovery by Cayrel et al. of U in CS 31082-001 along with Os and Ir at greatly enhanced abundances but with [Fe/H strongly reinforces the argument that there are at least two kinds of Type II supernova ] p 2.9 (SN II) sources for r-nuclei. One source is the high-frequency H events responsible for heavy r-nuclei ( ) A 1 135 but not Fe. The H-yields calculated from data on other ultra...
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 کاملStudy of the Element Abundances in Hd 140283: the Abundance Robustness of the Weak R- and Main Process Stars
As a brief revision, the origin of heavy elements and the role of abundances in extremely metal-poor (EMP) stars are presented. Heavy element abundances in the EMP uranium-rich star CS 31082-001 based mainly on near-UV spectra from STIS/HST are presented. These results should be useful for a better characterisation of the neutron exposure(s) that produced the r-process elements in this star, as...
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We present a high-resolution spectroscopic analysis of the extremely-metal-poor star CS 22957-027, which Beers et al. (1992) noted to exhibit a rather strong G-band. For T eff = 4839 K, derived from broadband photometry, our analysis obtains log g= 2.25, and a very low metallicity of [Fe/H]=−3.43 ± 0.12. The carbon-to-iron ratio is found to be enhanced by ≈ 2 dex relative to the solar value, si...
متن کاملAbundances in Very Metal-Poor Stars
Metal-poor stars provide information on the characteristics and chemical evolution of the halo population of the Galaxy, the first epoch of star formation and Galaxy formation (not just locally but with relevance to high-redshift objects), and big bang nucleosynthesis. This review looks at recent developments in this subject.
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2009
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921310000347