Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Re-classification of the alleged quasar Q0045-3337   We present a medium-resolution optical spectrum of the alleged high-redshift
quasar Q0045-3337, taken at the ESO/3.6m telescope. Our observations show that
the object is not a quasar but a star of spectral type B. We suggest that the
object is either a white dwarf or a halo population Blue Horizontal Branch
star.

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The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin