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Astron. Astrophys. 362, 666-672 (2000)


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First UVES observations of beryllium in very metal-poor stars *

F. Primas 1, P. Molaro 2, P. Bonifacio 2 and V. Hill 1

1 European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
2 Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, 34100 Trieste, Italy

Received 14 April 2000 / Accepted 14 August 2000

Abstract

We report on a attempt to detect beryllium in two dwarf stars of the Galactic halo with metallicities below one thousandth solar. The data were obtained during the Commissioning of the Ultraviolet and Visible Echelle Spectrograph (UVES) mounted on the ESO VLT Kueyen telescope, and show the potential of UVES for studies in the UV-optical domain. We claim a beryllium detection in LP 815-43 ([Fe/H] [FORMULA]2.95, [Be/H] = -13.09) at the 99.7% confidence level, while only an upper limit can be set for the second target CD-24o17504 ([Fe/H] [FORMULA]3.30, [Be/H] [FORMULA]13.39). These results suggest that the trend of beryllium with metallicity keeps decreasing as lower metallicities are probed, with no evidence for flattening. In CD-24o17504 we also analyzed the LiI line at 6708 Å, and derived a lithium abundance close to the Spite plateau.

Key words: stars: Population II – stars: abundances – stars: atmospheres – Galaxy: halo

* Based on public data released from the UVES Commissioning at the VLT/Kueyen telescope, European Southern Observatory, Paranal, Chile

Send offprint requests to: F. Primas (fprimas@eso.org)

© European Southern Observatory (ESO) 2000

Online publication: October 24, 2000

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