Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chemical compositions and kinematics of the Hercules stream   An abundance analysis is reported of 58 K giants identified by Famaey et al.
(2005) as highly probable members of the Hercules stream selected from stars
north of the celestial equator in the Hipparcos catalogue. The giants have
compositions spanning the interval [Fe/H] from $-$0.17 to $+$0.42 with a mean
value of $+$0.15 and relative elemental abundances [El/Fe] representative of
the Galactic thin disc. Selection effects may have biassed the selection from
the Hipparcos catalogue against the selection of metal-poor stars. Our
reconsideration of the recent extensive survey of FG dwarfs which included
metal-poor stars (Bensby et al. 2014) provides a [Fe/H] distribution for the
Hercules stream which is similar to that from the 58 giants. It appears that
the stream is dominated by metal-rich stars from the thin disc. Suggestions in
the literature that the stream includes metal-poor stars from the thick disc
are discussed.

29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph