New lithium observations of two (Fe/H) = -3.5 or less dwarfs

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Dwarf Stars, Lithium, Main Sequence Stars, Metallicity, Stellar Composition, Iron, Stellar Spectra, Subdwarf Stars

Scientific paper

We report new lithium observations for the extremely metal-poor main-sequence turnoff stars CS 22876-32 and CS 29527-15. High signal-to-noise echelle spectra show a 11 mA feature at 6707A for the brighter component of the double-lined spectroscopic binary CS 22876-32. With a magnitude difference estimated at 1.2 mag and a velocity shift of 28 km/s between components, its inferred logarithmic lithium abundance is N(Li) = 12 + log (Li/H) = 2.02 +/- 0.18, which is consistent with the Spite plateau abundance 2.10 +/- 0.10. However, CS 29527-15, with an estimated (Fe/H) = -3.4 and T(eff) = 6250 K, shows no lithium feature at a 3 sigma detection limit of 10 mA. CS 29527-15 appears to be lithium depleted by a factor of two or more relative to other halo stars of its temperature.

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