Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..990..164b&link_type=abstract
FIRST STARS III: First Stars II Conference. AIP Conference Proceedings, Volume 990, pp. 164-166 (2008).
Astronomy and Astrophysics
Astronomy
3
Population Ii Stars, Chemical Composition And Chemical Evolution, Abundances, Chemical Composition, Astronomical And Space-Research Instrumentation, Star Formation
Scientific paper
Beryllium, oxygen and iron abundances have been determined in 51 halo dwarf stars with [Fe/H] between -0.9 and -3.8. The spectra were obtained at high resolution (48,000) and high signal-to-noise (80-150), primarily with the upgraded HIRES on the Keck-I 10-m telescope. These spectra have been used to determine the stellar parameters: temperature, log g and [Fe/H]. The Be abundances have been found by spectrum synthesis of the Be II doublet at 3130.4 and 3131.1 A˚. Our sample also includes four stars observed with HDS on the Subaru 8-m telescope (Boesgaard & Novicki 2006) and 14 stars reanalyzed from Boesgaard et al. (1999) with the latest version of MOOG. Newly determined O abundances were found from three OH lines in the UV. We show the relationships between Be and [Fe/H], [O/H], and [O/Fe] and [Be/Fe] vs. [Fe/H] for the whole sample to trace the Galactic evolution of these elements. In addition we subdivided the sample into accretive and dissipative populations to examine possible differences.
Boesgaard Ann Merchant
Levesque Emily M.
Rich Jeffrey A.
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