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Chapter and Conference Paper
The ESO Large Programme “First Stars”
In ESO period 65 (April–September 2000) the large programme 165.N-0276, led by Roger Cayrel, began making use of UVES at the Kueyen VLT telescope. Known within the Team and outside as “First Stars”, it was aim...
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Chapter and Conference Paper
Evidence of Mixing in Extremely Metal-Poor Giants
Thirty five extremely metal-poor (EMP) giants (22 of them with a metallicity [Fe/H] ≤ -3.0) have been observed with UVES at the VLT. In these stars the abundance of lithium carbon and nitrogen and also the 12C/13
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Chapter and Conference Paper
Sulphur in the Early Ages of the Galaxy
We present here the results of the measurement of the sulphur abundance in very metal-poor stars. Our sample covers the [-4;-2] range of metallicity, and thus allows us to constraint the chemical evolution mod...
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Chapter and Conference Paper
Abundance of Heavy Elements in Extremely Metal-Poor Stars
In the framework of the VLT Large program “First Stars” (165.N-0276(A)), we have measured the abundance of 13 heavy elements using high quality UVES spectra. In this paper, we report on the abundance of Sr and...
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Article
Measurement of stellar age from uranium decay
The ages of the oldest stars in the Galaxy indicate when star formation began, and provide a minimum age for the Universe. Radioactive dating of meteoritic material1 and stars2 relies on comparing the present abu...
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Article
Where is SMC1? A Cautionary Tale: Recommendations About Astronomical Objects Designation
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Article
Abundances in Very Metal-Poor Stars
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Chapter and Conference Paper
Abundances in Very Metal-Poor Stars
Stars with a metallicity lower than [Fe/H] = −3 are of particular interest since they were formed early in the history of the Galaxy. The chemical compositions of their atmospheres represent the yields of the ...
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Chapter and Conference Paper
Where is SMC1? a Cautionary Tale: Recommendations about Astronomical Objects Designation
A growing number of papers and (more recently) of data in machine-readable form are made available to the community. For a full use of this exploding astronomical information, some actions have to be undertake...
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Article
Lithium Abundance in Pop.II Stars A post-HIPPARCOS discussion
The relation between the lithium abundance observed in Population II stars and the primordial abundance, is still an open question (see Cayrel and Duncan, this meeting). A few recent results are discussed. HIP...
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Article
51 Peg and Upsilon and: Confirmation of the Planet Hypothesis
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Chapter and Conference Paper
Lithium Abundance in Pop. II Stars
The relation between the lithium abundance observed in Population II stars and the primordial abundance, is still an open question (see Cayrel and Duncan, this meeting). A few recent results are discussed. HIP...
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Chapter and Conference Paper
Nucleosynthesis in the First Galactic Stars
Our aim is to study the detailed chemical composition of the first galactic stars, which contain an important record of the products of nucleosynthesis in the Big Bang and the earliest stellar generations. Sta...
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Chapter and Conference Paper
Lithium in Old Binary Stars
A detailed analysis of high resolution, high signal to noise spectra of twenty metal deficient binaries (−2.9 < [Fe/H] < −0.4) with periods ranging from 220d to 1.8d is presented. For most of the stars, in add...
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Chapter and Conference Paper
Observational Status of Lithium in Stars
Some of the new data about lithium abundance in stars are reviewed here. The data, that seem more directly linked with the problem of the primordial nucleosynthesis, are briefly discussed. In order to reach a ...
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Chapter and Conference Paper
CNO Overabundances in 6 Stars of ω Centauri
C2 and CN bandheads in the wavelength region λλ 550–680 nm are synthesized for 6 stars of ω Centauri, in order to derive their carbon and nitrogen abundances. Oxygen abundances are also derived taking into accou....
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Chapter and Conference Paper
Lithium in Population II Stars
NEW data about dwarfs : a few more metal-poor dwarfs have been observed for lithium at the CAT + CES at La Silla (ESO). These new results, together with a few new measurements in the literature show again a co...
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Article
Specifications concerning names, designations, and nomenclature for astronomical radiation sources outside the solar system
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Chapter and Conference Paper
Accuracy of the determination of the abundances in solar type stars
The accuracy of the abundances are of course especially interesting when compared to some variations observed : the problem is to find if these variations are significantly larger than the uncertainties. The a...
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Chapter
Documentation and Astronomical Data
The aims of this report are, firstly, to review the activities of Commission 5 during the period since the IAU General Assembly in Delhi in November 1985 and, secondly, to draw attention to other relevant acti...
