Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence of enhanced magnetism in cool, polluted white dwarfs   We report the discovery of a new, polluted, magnetic white dwarf in the
Luyten survey of high-proper motion stars. High-dispersion spectra of NLTT 7547
reveal a complex heavy element line spectrum in a cool (~5 200 K)
hydrogen-dominated atmosphere showing the effect of a surface averaged field of
163 kG, consistent with a 240 kG centred dipole, although the actual field
structure remains uncertain. The abundance pattern shows the effect of accreted
material with a distinct magnesium-rich flavour. Combined with earlier
identifications, this discovery supports a correlation between the incidence of
magnetism in cool white dwarfs and their contamination by heavy elements.

17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th