The Giants Stars HE 0107-5240 and HE 0557-4840 and New Searches for Metal-Poor Stars

Details The Giants Stars HE 0107-5240 and HE 0557-4840 and New Searches for Metal-Poor Stars The Giants Stars HE 0107-5240 and HE 0557-4840 and New Searches for Metal-Poor Stars

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..990..109c&link_type=abstract

FIRST STARS III: First Stars II Conference. AIP Conference Proceedings, Volume 990, pp. 109-112 (2008).

Computer Science

Databases

3

Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc., Population Ii Stars, Abundances, Chemical Composition, Population Iii Stars, Origin, Formation, And Abundances Of The Elements

Scientific paper

We report on a new determination of the iron abundance of HE 0107-5240, based on the detection of two Fe II lines in an UV spectrum of the star, which yields [Fe/H] = -5.7. Another interesting metal-poor star recently discovered with Hamburg/ESO Survey (HES) is HE 0557-4840. With [Fe/H] = -4.8, it is the first star located in the ``gap'' in the metallicity distribution function of the galactic halo, in metallicity between the two stars known at [Fe/H]>-4.0. HE 0557-4840 is carbon-enhanced (i.e., [C/Fe] = +1.7). The abundance ratios of the heavier elements are similar to those seen in the majority of the metal-poor stars at [Fe/H]>-4.0.
We also describe two upcoming wide-angle surveys which will be used for searches for metal-poor stars: The Southern Sky Survey (SSS), and a stellar survey to be conducted with the Chinese LAMOST telescope. These efforts are expected to increase the number of known extremely metal-poor stars, including stars below [Fe/H] = -5.0, by about two orders of magnitude.

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