Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parent Stars of Extrasolar Planets. VIII. Chemical Abundances for 18
  Elements in 31 Stars   We present the results of detailed spectroscopic abundance analyses for 18
elements in 31 nearby stars with planets. The resulting abundances are combined
with other similar studies of nearby stars with planets and compared to a
sample of nearby stars without detected planets. We find some evidence for
abundance differences between these two samples for Al, Si and Ti. Some of our
results are in conflict with a recent study of stars with planets in the SPOCS
database. We encourage continued study of the abundance patterns of stars with
planets to resolve these discrepancies.

23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph