Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Spectroscopic Study of HL Canis Majoris   We present optical spectroscopy of the dwarf nova HL Canis Majoris over a
span of four years. The observations were made during standstill, outburst, and
quiescence. We determine an orbital period of 0.2167867 +/- 0.0000017 days,
based on radial velocities determined from H-alpha, H-beta, and He I 5876
emission. We also present equivalent widths of the spectral features in
outburst and in quiescence.

17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc