Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray Emission from Planetary Nebulae and their Central Stars: a Status
  Report   In the era of Chandra and XMM-Newton, the detection (or nondetection) of
diffuse and/or point-like X-ray sources within planetary nebulae (PNe) yields
important, unique insight into PN shaping processes. Diffuse X-ray sources,
whether due to ``hot bubbles'' or to collimated outflows or jets, allow us to
probe the energetic shocks within PN wind interaction regions. Meanwhile, X-ray
point sources provide potential diagnostics of magnetic fields, accretion
disks, and/or binary companions at PN cores. Here, I highlight recent X-ray
observational results and trends that have the potential to shed new light on
the origin and evolution of the structure of PNe.

10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
31
The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math