Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of lithium in solar-type stars: clues from intermediate age
  clusters   We present Li abundances for 14 solar-type stars in the intermediate age (~ 2
Gyr) clusters IC 4651 and NGC 3680. The log n(Li) vs. effective temperature
distributions are compared with those of the similar age cluster NGC 752, of
the younger Hyades (600 Myr) and of the older M 67 (4.5 Gyr) and NGC 188 (6-7
Gyr) clusters. Neither IC 4651 nor NGC 3680 show the dispersion in Li which is
observed in M 67. The 2 Gyr clusters have very similar Li vs. effective
temperature distributions; in addition, stars in the upper envelope of the M 67
distribution have the same Li content as stars in the 2 Gyr clusters,
suggesting that either they have not suffered any significant depletion between
2 and 4.5 Gyr or they had a much slower Li depletion. Mechanisms that lead to
Li depletion on the main sequence are discussed in the light of these
observations. None of the existing models seem to reproduce well the observed
features.

27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg