منابع مشابه
Abundances of Extremely Metal-Poor Star Candidates
We present chemical abundances for 110 stars identified in objective-prism surveys as candidates to be very metal-poor. The abundances are derived from high S/N, intermediate-resolution spectra obtained with the Keck Observatory Echelle Spectrometer and Imager. An additional 25 stars with well-determined abundances ranging from [Fe/H]= −1.5 and −3.2 were observed and the results used to help ca...
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We present a detailed chemical abundance analysis of HE 1300+0157, a subgiant with [Fe/H] = −3.9. From a high-resolution, high-S/N Subaru/HDS spectrum we find the star to be enriched in C ([C/Fe]1D ∼ +1.4) and O ([O/Fe]1D ∼ +1.8). With the exception of these species, HE 1300+0157 exhibits an elemental abundance pattern similar to that found in many other very and extremely metal-poor stars. The...
متن کاملCS 22957 - 027 : a carbon - rich extremely - metal - poor star ?
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 کاملA New Type of Extremely Metal Poor Star
We present an abundance analysis for the extremely metal poor star HE1424−0241 based on high dispersion spectra from HIRES at Keck. This star is a giant on the lower red giant branch with [Fe/H] ∼ −4.0 dex. Relative to Fe, HE1424−0241 has normal Mg, but it shows a very large deficiency of Si, with ǫ(Si)/ǫ(Fe) ∼ 1/10 and ǫ(Si)/ǫ(Mg) ∼ 1/25 that of all previously known extremely metal poor giants...
متن کاملMmt Extremely Metal Poor Galaxy Survey I. an Efficient Technique to Identify Metal Poor Galaxies
We demonstrate a successful strategy for identifying extremely metal poor galaxies. Our preliminary survey of 24 candidates contains 10 metal poor galaxies of which 4 have log(O/H) + 12< 7.65, some of the lowest metallicity blue compact galaxies known to date. Interestingly, our sample of metal poor galaxies have systematically lower metallicity for their luminosity than comparable samples of b...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2008
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200810028