Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ESpeRo: Echelle Spectrograph Rozhen   In this paper we describe the echelle spectrograph of the 2 meter telescope
of the Rozhen National Astronomical Observatory. The spectrograph is a
cross-dispersed, bench-mounted, fiber-fed instrument giving a resolution from
$\sim$30000 to $\sim$45000. The spectral range obtained in one single image is
from 3900 to 9000 {\AA}. We describe the parameters of the fiber injection and
the guiding unit, of the spectrograph itself, and of the detector. The
identified orders and the resulting resolving power are presented. The
opportunity to increase of the resolution by using a narrower slit is discussed
and the corresponding loss of flux is calculated. The expected signal-to-noise
ratio for a set of stars of different magnitudes was derived. Some of the first
results obtained with ESpeRo are shortly described.

2
The categories of this paper are: math
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat