Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Predicted chemical evolution for spiral disks from their observed
  rotation curves   The rotation curves for a sample of 67 spiral galaxies observed by Marquez et
al(2002) have been used as input for the multiphase chemicale volution model.
By using N[II]/Halpha as estimator of the oxygen abundance, we constraint the
possible models for each galaxy. We may, then, predict the time evolution of
these galaxies and the present time radial distribution for gas, stars and star
formation surface densities and elemental abundances.

17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph