Beryllium Abundances in Metal-Poor Stars

Details Beryllium Abundances in Metal-Poor Stars Beryllium Abundances in Metal-Poor Stars

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8806b&link_type=abstract

American Astronomical Society Meeting 210, #88.06; Bulletin of the American Astronomical Society, Vol. 39, p.201

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on beryllium abundances in more than 50 halo dwarf stars with [Fe/H] between -0.9 and -3.5. Spectra have been obtained at high resolution ( 48,000) and high signal-to-noise (80-150) 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 includes 4 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 found from three OH lines in the UV are presented. We show the relationships between Be and [Fe/H], [O/H], and [O/Fe] and [Be/Fe] vs. [Fe/H] for the whole sample and also subdivide sample into accretive and dissipative populations. The issue of an intrinsic spread in Be at a given metallicity is discussed.
This research was supported by NSF through grant AST 05-05899.

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