Be-9 abundances in dwarfs of intermediate metal deficiency - Implications for galactic evolution

Details Be-9 abundances in dwarfs of intermediate metal deficiency - Implications for galactic evolution Be-9 abundances in dwarfs of intermediate metal deficiency - Implications for galactic evolution

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.157...41b&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Astronomy and Astrophysics

Astrophysics

3

Beryllium 9, Dwarf Stars, Galactic Evolution, Metallicity, Abundance, Chemical Evolution

Scientific paper

This paper presents observations of the 3130 A Be II resonance doublet in stars of intermediate metal deficiency, with Fe/H values between -0.6 and -1.1, obtained with the Intermediate Dispersion Spectrographs and IPCS detector at the 2.5 m Isaac Newton Telescope on La Palma. The derived beryllium abundances range from 5.6 x 10 to the -12th (one half solar) to 2 x 10 to the -12th (one sixth solar). These values, interpolated between the sets of previous beryllium measurements at higher and at lower metallicities, serve to confirm the monotonic variation of the Be abundance with Fe during the evolution of the galactic disk. It is found that there was no extreme burst of Be production in the halo. To circumvent the effects of depletion, a statistical set of data is needed, for which the upper envelope can be used to trace galactic Be evolution. It is noted that no observations with sufficient sensitivity to detect Be in the extremely metal deficient stars of the halo have been reported to date.

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