Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new survey of variability in the core of M15 with TRIFFID-2   A two-week campaign of high-resolution imaging of the centre of M15 using the
tip/tilt correcting TRIFFID-2 camera, followed by analysis with ISIS (image
matching & subtraction software), has produced the most sensitive survey to
date of variable stars in the central ~1x1 arcmin^2 - a total of 48 were
detected -, and constrains the size of the dwarf nova population.

7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn