Keck Observation of Lithium in a Cool Halo Dwarf CommonProper Motion


We exploit the uniform age and initial chemical composition of the halo common proper motion pair, HD 134439 and HD 134440, to eliminate metallicity{ and age{dependent eeects in an investigation of Li processing in cool, metal{poor dwarfs. We have obtained a very high S/N (480) Keck observation of Li in HD 134440, and derive a 3 upper limit on its lithium… (More)


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