Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray Observations of Neutron Star Binaries: Evidence for Millisecond
  Spins   High amplitude X-ray brightness oscillations during thermonuclear X-ray
bursts were discovered with the Rossi X-ray Timing Explorer (RXTE) in early
1996. Spectral and timing evidence strongly supports the conclusion that these
oscillations are caused by rotational modulation of the burst emission and that
they reveal the spin frequency of neutron stars in low mass X-ray binaries
(LMXB), a long sought goal of X-ray astronomy. I briefly review the status of
our knowledge of these oscillations. So far 10 neutron star systems have been
observed to produce burst oscillations, interestingly, the observed frequencies
cluster in a fairly narrow range from about 300 - 600 Hz, well below the
break-up frequency for most modern neutron star equations of state (EOS). This
has led to suggestions that their spin frequencies may be limited by the loss
of angular momentum due to gravitational wave emission. Connections with
gravity wave rotational instabilities will be briefly described.

31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con