Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Collaborating with "professional" amateurs: low-mass stars in fragile
  multiple system   The boundary between professional and amateur astronomers gets narrower and
narrower. We present several real examples, most of them published in refereed
journals, of works resulting from fruitful collaborations between key amateur
astronomers in Spain and professional colleagues. The common denominator of
these works is the search for binaries, mostly nearby, wide, common
proper-motion pairs with low-mass stellar components, including some of the
most fragile systems ever found.

11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas