Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: INTEGRAL observations of HER X-1   First results of observations of the low mass X-ray binary Her X-1/HZ Her
performed by the INTEGRAL satellite in July-August 2005 are presented. A
significant part of one 35 day main-on state was covered. The cyclotron line in
the X-ray spectrum is well observed and its position and shape, as well as its
variability with time and phase of the 1.24 s pulsation are explored. X-ray
pulse profiles for different energy bands are studied throughout the
observation. The pulse period is found to vary on short time scales revealing a
dynamical spin-up/spin-down behavior. Results of simultaneous optical
observations of HZ Her are also discussed.

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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: eess
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: supr-con
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The categories of this paper are: stat