Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Infrared spectroscopy of low-mass X-ray binaries II   Using CGS4 on UKIRT, we have obtained 2.00-2.45 micron infrared spectra of a
number of low-mass X-ray binaries including Sco X-1, Sco X-2, and GX13+1. Sco
X-1 shows emission lines only, supporting our previous conclusion that the
spectral type of the evolved secondary must be earlier than G5. Emission lines
are also seen in the spectrum of Sco X-2, confirming the identity of the IR
counterpart. We report the detection of CO bands in GX13+1 and estimate the
most likely spectral type of the secondary to be K5 III. We also find P Cygni
type profiles in the Brackett gamma lines of Sco X-1 and GX13+1, indicating the
presence of high velocity outflows in these systems. We present spectra of
candidate IR counterparts to several other elusive X-ray binaries. Finally,
implications for the nature and classification of these systems are discussed.

15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat