Reference : The long period eccentric orbit of the particle accelerator HD 167971 revealed by lon...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/118014
The long period eccentric orbit of the particle accelerator HD 167971 revealed by long baseline interferometry
English
De Becker, Michaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)]
Sana, H [> > > >]
Absil, Olivier mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)]
Le Bouquin, J-B [> > > >]
Blomme, R [> > > >]
Jul-2012
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
423
2711-2717
Yes (verified by ORBi)
International
0035-8711
Oxford
United Kingdom
[en] Astrophysics ; Interferometry ; Particle acceleration ; Stars: massive ; Binary stars
[en] Using optical long baseline interferometry, we resolved for the first time the two wide components of HD167971, a candidate hierarchical triple system known to efficiently accelerate particles. Our multi-epoch VLTI observations provide direct evidence for a gravitational link between the O8 supergiant and the close eclipsing O + O binary. The separation varies from 8 to 15 mas over the three-year baseline of our observations, suggesting that the components evolve on a wide and very eccentric orbit (most probably e>0.5). These results provide evidence that the wide orbit revealed by our study is not coplanar with the orbit of the inner eclipsing binary. From our measurements of the near-infrared luminosity ratio, we constrain the spectral classification of the components in the close binary to be O6-O7, and confirm that these stars are likely main-sequence objects. Our results are discussed in the context of the bright non-thermal radio emission already reported for this system, and we provide arguments in favour of a maximum radio emission coincident with periastron passage. HD167971 turns out to be an efficient O-type particle accelerator that constitutes a valuable target for future high angular resolution radio imaging using VLBI facilities.
Researchers ; Professionals
http://hdl.handle.net/2268/118014
10.1111/j.1365-2966.2012.21081.x
http://cdsads.u-strasbg.fr/doi/10.1111/j.1365-2966.2012.21081.x

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