Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pollution of single white dwarfs by accretion of many small asteroids   Extrapolating from the solar system's asteroid belt, we propose that
externally-contaminated white dwarfs without an infrared excess may be
experiencing continuous accretion of gas-phase material that ultimately is
derived from the tidal destruction of multiple small asteroids. If this
scenario is correct, then observations of metal-polluted white dwarfs may lead
to determining the bulk elemental compositions of ensembles of extrasolar minor
planets.

29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat