Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiwavelength Observations of the Runaway Binary HD 15137   HD 15137 is an intriguing runaway O-type binary system that offers a rare
opportunity to explore the mechanism by which it was ejected from the open
cluster of its birth. Here we present recent blue optical spectra of HD 15137
and derive a new orbital solution for the spectroscopic binary and physical
parameters of the O star primary. We also present the first XMM-Newton
observations of the system. Fits of the EPIC spectra indicate soft, thermal
X-ray emission consistent with an isolated O star. Upper limits on the
undetected hard X-ray emission place limits on the emission from a proposed
compact companion in the system, and we rule out a quiescent neutron star in
the propellor regime or a weakly accreting neutron star. An unevolved secondary
companion is also not detected in our optical spectra of the binary, and it is
difficult to conclude that a gravitational interaction could have ejected this
runaway binary with a low mass optical star. HD 15137 may contain an elusive
neutron star in the ejector regime or a quiescent black hole with conditions
unfavorable for accretion at the time of our observations.

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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio