TOPoS. IV. Chemical abundances from high-resolution observations of seven extremely metal-poor stars
Sign Up to like & getrecommendations! Published in 2018 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201732320
Abstract: Context. Extremely metal-poor (EMP) stars provide us with indirect information on the first generations of massive stars. The TOPoS survey has been designed to increase the census of these stars and to provide a chemical… read more here.
Keywords: poor stars; metal poor; sdss; extremely metal ... See more keywords
Inhomogeneity in the early Galactic chemical enrichment exposed by beryllium abundances in extremely metal-poor stars
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DOI: 10.1051/0004-6361/202039101
Abstract: Abundances of beryllium in metal-poor stars scale linearly with metallicity down to [Fe/H] ~ -3.0. In the stars where Be has been detected at this extremely metal-poor regime, an increased abundance scatter has been previously… read more here.
Keywords: poor stars; metal poor; abundances extremely; inhomogeneity early ... See more keywords
The extended He II λ4686 emission in the extremely metal-poor galaxy SBS 0335 - 052E seen with MUSE
Sign Up to like & getrecommendations! Published in 2018 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/sty1920
Abstract: This study in based on observations collected at the European Southern Observatory. We are very grateful to our referee for providing constructive comments and help in improving the manuscript. This work has been partially funded… read more here.
Keywords: metal poor; extremely metal; poor galaxy; extended 4686 ... See more keywords
Fingerprint of the first stars: multi-enriched extremely metal-poor stars in the TOPoS survey
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DOI: 10.1093/mnras/sty2783
Abstract: Extremely metal poor (EMP) stars in the Milky Way inherited the chemical composition of the gas out of which they formed. They therefore carry the chemical fingerprint of the first stars in their spectral lines.… read more here.
Keywords: metal poor; extremely metal; first stars; fingerprint first ... See more keywords
Indications for a Nonzero Lepton Asymmetry from Extremely Metal-Poor Galaxies.
Sign Up to like & getrecommendations! Published in 2022 at "Physical review letters"
DOI: 10.1103/physrevlett.130.131001
Abstract: The recent measurement of helium-4 from the near-infrared spectroscopy of extremely metal-poor galaxies by the Subaru Survey may point to a new puzzle in the early Universe. We exploit this new helium measurement together with… read more here.
Keywords: poor galaxies; nonzero lepton; metal poor; extremely metal ... See more keywords