Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-dimensional orbits of the triple-O stellar system HD 150136   Context. HD 150136 is a triple hierarchical system and a non-thermal radio
emitter. It is formed by an O3-3.5 V + O5.5-6 V close binary and a more distant
O6.5-7 V tertiary. So far, only the inner orbital properties have been reliably
constrained.
  Aims. To quantitatively understand the non-thermal emission process, accurate
knowledge of the physical and orbital properties of the object is crucial.
Here, we aim to investigate the orbital properties of the wide system and to
constrain the inclinations of the inner and outer binaries, and with these the
absolute masses of the system components.
  Methods. We used the PIONIER combiner at the Very Large Telescope
Interferometer to obtain the very first interferometric measurements of HD
150136. We combined the interferometric observations with new and existing high
resolution spectroscopic data to derive the orbital solution of the outer
companion in the three-dimensional space.
  Results. The wide system is clearly resolved by PIONIER, with a projected
separation on the plane of the sky of about 9 milli-arcsec. The best-fit
orbital period, eccentricity, and inclination are 8.2 yr, 0.73 and 108 degr. We
constrain the masses of the three stars of the system to 63 +/- 10, 40 +/- 6,
and 33 +/- 12 Msun for the O3-3.5 V, O5.5-6 V and O6.5-7 V components.
  Conclusions. The dynamical masses agree within errors with the evolutionary
masses of the components. Future interferometric and spectroscopic monitoring
of HD 150136 should allow one to reduce the uncertainties to a few per cent
only and to accurately constrain the distance to the system. This makes HD
150136 an ideal system to quantitatively test evolutionary models of high-mass
stars as well as the physics of non-thermal processes occurring in O-type
systems.

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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg