An extreme Population II dwarf without lithium

Details An extreme Population II dwarf without lithium An extreme Population II dwarf without lithium

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373l..47h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 373, June 1, 1991, p. L47-L49.

Other

46

Dwarf Stars, Lithium, Stellar Evolution, Universe, Absorption Spectra, Abundance, Astronomical Spectroscopy, Metallicity

Scientific paper

G186 - 26 is an apparently normal, Population II dwarf with Fe/H = - 2.9 and Te = 6220 K. A high-dispersion spectrogram of this extreme halo star recorded at the Li I 6707 line shows no detectable surface lithium, at an abundance upper limit N(Li) = 12 + log (Li/H) not greater than 1.23. In comparison with the uniform lithium abundance N(Li) of about 2.17 found previously in 11 other halo dwarfs with Fe/H less than about -2.6, the minimum deficiency of surface lithium in G 186 - 26 therefore exceeds a factor of 8.

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