Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiple stars: designation, catalogues, statistics   Discussion of the designation of multiple-star components leads to a
conclusion that, apart from components, we need to designate systems and
centers-of-mass. The hierarchy is coded then by simple links to parent. This
system is adopted in the multiple star catalogue, now available on-line. A
short review of multiple-star statistics is given: the frequency of different
multiplicities in the field, periods of spectroscopic sub-systems, relative
orbit orientation, empirical stability criterion, and period-period diagram
with its possible connection to formation of multiple stars.

9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys