Key points are not available for this paper at this time.
Context . The small- to intermediate-mass (M 6.0. A feature compatible with the Li doublet at 670.7 nm is tentatively detected. Conclusions . The upper limit on carbon implies Z < 1.915 × 10 −6 , more than 20 times lower than the most iron-poor star known. Therefore, the gas cloud out of which the star was formed did not cool via atomic lines but probably through dust. Fragmentation of the primordial cloud is another possibility for the formation of a star with a metallicity this low.
Caffau et al. (Wed,) studied this question.