Introduction to Lithium Abundances

What is/are Lithium Abundances?

Lithium Abundances - Formation environment leaves no imprint on lithium abundances. ^[1] Investigating the lithium abundances to a uniquely large sample of stars is essential to understand its origin and evolution. ^[2] We present the spectral analysis, including measurements of radial velocities, atmospheric parameters and lithium abundances. ^[3] The cosmological lithium problem (CLP) stems from the outstanding discrepancy between theoretical predictions and astronomical observations of primordial lithium abundances. ^[4] The comparison with stellar evolution models confirms that classical models cannot reproduce the lithium abundances observed in the metallicity and mass regimes covered by the data. ^[5] Based on a sample of 1848 giants with known evolutionary phases and lithium abundances from the LAMOST-Kepler and LAMOST-K2 fields, we construct mass–radius diagrams to characterize the evolutionary features of lithium. ^[6] Accurately known stellar lithium abundances may be used to shed light on a variety of astrophysical phenomena such as big bang nucleosynthesis, radial migration, ages of stars and stellar clusters, and planet engulfment events. ^[7] Lithium abundances for red giants in theGALAHDR3 survey are studied. ^[8] In contrast, the more evolved RC stars (>40 Myr post-CHeF) generally have low lithium abundances (A(Li) <1. ^[9] However, recent studies show that almost all of red clump stars have high lithium abundances A(Li)>-0. ^[10] The lithium abundances of stars in the halo are higher than in the field and correlated with the stellar rotation rate and binarity fraction, as has been noted in other young open clusters. ^[11] We compared the lithium abundances derived for a large sample of stars (from the turn-off to the red giant branch) in each cluster. ^[12] The upper envelope of the lithium abundances in unevolved stars spanning more than three orders of magnitude in metallicity (−6 <[Fe/H]< −2. ^[13] The discrepancy between the theoretical prediction of primordial lithium abundances and astronomical observations is called the Lithium Problem. ^[14] The upper envelope of the lithium abundances in unevolved stars spanning more than three orders of magnitude in metallicity (−6 < [Fe/H] < −2. ^[15] Lithium abundances have been adjusted to the same scale for 103 stars in M 67 by Pace et al. ^[16] To arrive to such a result, we took advantage of the AMBRE catalog of lithium abundances combined with chemical evolution models which take into account the contribution to the lithium enrichment by different nucleosynthetic sources. ^[17]

Primordial Lithium Abundances

The cosmological lithium problem (CLP) stems from the outstanding discrepancy between theoretical predictions and astronomical observations of primordial lithium abundances. ^[1] The discrepancy between the theoretical prediction of primordial lithium abundances and astronomical observations is called the Lithium Problem. ^[2]