Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First X-ray observations of the polar CE Gru   We report the detection of the polar CE Gru in X-rays for the first time. We
find evidence for a dip seen in the hard X-ray light curve which we attribute
to the accretion stream obscuring the accretion region in the lower hemisphere
of the white dwarf. The X-ray spectrum can be fitted using only a shock model:
there is no distinct soft X-ray component. We suggest that this is because the
reprocessed component is cool enough so that it is shifted into the UV. We
determine a mass for the white dwarf of ~1.0Msun.

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The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex