Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Detection of Wind Variability in Magellanic Cloud O Stars   We present Far Ultraviolet Explorer (FUSE) spectra for three Magellanic Cloud
O stars (Sk 80, Sk -67 05 and Sk -67 111) with repeated observations. The data
demonstrate the capabilities of FUSE to perform time-resolved spectroscopy on
extragalactic stars. The wavelength coverage of FUSE provides access to
resonance lines due to less abundant species, such as sulfur, which are
unsaturated in O supergiants. This allows us to examine wind variability at all
velocities in resonance lines for stars with higher mass loss rates than can be
studied at longer (lambda > 1150 A) wavelengths. The FUSE wavelength range also
includes resonance lines from ions which bracket the expected dominant
ionization stage of the wind. Our observations span 1-4 months with several
densely sampled intervals of 10 hours or more. These observations reveal wind
variability in all of the program stars and distinctive differences in the
ionization structure and time scales of the variability. Sk -67 111
demonstrates significant wind variability on a time scale less than 10 hours
and the coolest O star (Sk -67 05) exhibits the largest variations in O VI.

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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph