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Lithium in the local Volume
14 Novembre 2019 @ 11:45 - 12:45
We present our recent study on the chemical evolution of lithium in the thin disc of the Milky Way.
We found that the best agreement with the observed Li abundances in the thin disc is obtained
considering novae as the main source of lithium. We assumed a delay time of ≈1 Gyr for nova
production and an effective 7Li yield of 1.8(± 0.6)×10−5 Msun over the whole nova lifetime.
The possibility to check our detailed assumptions on lithium production on other stellar systems, such
as the satellites of our Milky Way, is seriously hampered by their distance from us. In these systems
dwarf stars (where the original lithium can be measured) are too faint to detect lithium lines.
However, thanks to the Gaia mission, it was recently possible to disentangle the stars of a disrupted
dwarf galaxy in the Galactic halo (called Enceladus or Galactic sausage). Adopting a chemical evolution
model able to match the chemical enrichment in alpha elements and the metallicity distribution function
of Enceladus, we present our prediction for the lithium abundance of the stars of this disrupted galaxy.