Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Origin of Metals in Some Hot White Dwarf Photospheres   We have searched for evidence for dust and gas disks at a sample of hot DA
white dwarfs 20 000K < Teff < 50 000K, without success. Although their
atmospheres are polluted with heavy elements, we cannot yet convincingly and
conclusively show that any of these objects is accreting metals from
surrounding material derived from disrupted minor planets in an old solar
system.

16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat