Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: sdA in SDSS DR12 are Overwhelmingly Not Extremely Low-Mass (ELM) White
  Dwarfs   In a search for new white dwarfs in DR12 of the Sloan Digital Sky Survey,
Kepler et al. (2016) found atmospheric parameters for thousands of objects with
effective temperatures below 20,000 K and surface gravities between 5.5 <
log(g) < 6.5. They classified these objects as cool subdwarfs -- sdA -- and
speculated that many may be extremely low-mass (ELM) white dwarfs (helium-core
white dwarfs with masses below 0.3 Msun). We present evidence -- using radial
velocities, photometric colors, and reduced proper motions -- that the vast
majority (>99%) of these objects are unlikely to be ELM white dwarfs. Their
true identity remains an interesting question.

1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom