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OXYGEN ABUNDANCES IN LOW- AND HIGH-alpha FIELD HALO STARS AND THE DISCOVERY OF TWO FIELD STARS BORN IN GLOBULAR CLUSTERS
(IOP PUBLISHING LTDBRISTOL, 2012)
Oxygen abundances of 67 dwarf stars in the metallicity range -1.6 < [Fe/H] < -0.4 are derived from a non-LTE analysis of the 777 nm O I triplet lines. These stars have precise atmospheric parameters measured by Nissen ...
Possible signature of hypernova nucleosynthesis in a beryllium-rich halo dwarf
(WILEY-BLACKWELL, 2008)
As part of a large survey of halo and thick disc stars, we found one halo star, HD106038, exceptionally overabundant in beryllium. In spite of its low metallicity, [Fe/H] = -1.26, the star has log(Be/H) = -10.60, which is ...
A SEARCH FOR UNRECOGNIZED CARBON-ENHANCED METAL-POOR STARS IN THE GALAXY
(IOP PUBLISHING LTD, 2010)
We have developed a new procedure to search for carbon-enhanced metal-poor (CEMP) stars from the Hamburg/ESO (HES) prism-survey plates. This method employs an extended line index for the CH G band, which we demonstrate to ...
Metal-poor stars observed with the Magellan Telescope. II. Discovery of four stars with [Fe/H] <= −3.5
(American Astronomical SocietyChicago, 2014)
We report on the discovery of seven low-metallicity stars selected from the Hamburg/ESO Survey, six of which are
extremely metal-poor (EMP, [Fe/H] −3.0), with four having [Fe/H] −3.5. Chemical abundances or upper
limits ...