Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elemental abundance trends in the metal-rich thin and thick disks   Thick disks are common in spiral and S0 galaxies and seem to be an inherent
part of galaxy formation and evolution. Our own Milky Way is host to an old
thick disk. The stars associated with this disk are enhanced in the
alpha-elements as compared to similar stars present in the thin disk. The Milky
Way thin disk also appears to be younger than the thick disk. Elemental
abundance trends in stellar samples associated with the thin and the thick
disks in the Milky Way are reviewed. Special attention is paid to how such
samples are selected. Our current understanding of the elemental abundances and
ages in the Milky Way thick and thin disks are summarised and discussed. The
need for differential studies is stressed. Finally, formation scenarios for the
thick disk are briefly discussed in the light of the current observational
picture.

33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex