Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: FUSE Survey of the Local Interstellar Medium within 200 Parsec   We present FUSE observations of the interstellar gas toward 30 white dwarf
and 1 subdwarf (SdO) stars. These sightlines probe the Local Bubble (LB) and
the local interstellar medium (LISM) near the LB. Our survey detected only
diffuse H_2 molecular clouds along six sightlines. There is no evidence from
this study that H_2 exists well inside the perimeter of the LB. The kinematical
temperature for H_2 is less than the usual temperature observed in the local
interstellar clouds, implying different gas phases in the LISM. The relative
abundance ratios of Si II, P II, and Fe II give insight about the dust content.
These ratios vary, but are similar to the depletion patterns observed in warm
and halo diffuse clouds in more distant sightlines in the Galaxy. The N I/O I
and Ar I/O I ratios are significantly subsolar within the LB. Outside the LB a
larger scatter is observed from subsolar to solar. Because Ar and N are only
weakly depleted into dust grains if at all, the deficiencies of their neutral
forms are likely due to photoionization. The evidence for significant
ionization of N (and hence Ar) is strengthened by the detection and measurement
of N II, which is a dominant ion for this element toward many sightlines. These
observations imply that photoionization is the main ionization mechanism in the
LISM and do not support the existence of a highly ionized condition in the
past. In view of the variations observed in the different atomic and ionic
ratios, the photoionization conditions vary significantly in the LB and the
LISM. [Abridged.]

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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga