Reference : Long-term XMM-Newton investigation of two particle-accelerating colliding-wind bina...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/182374
Long-term XMM-Newton investigation of two particle-accelerating colliding-wind binaries in NGC6604: HD168112 and HD167971
English
De Becker, Michaël mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Jul-2015
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
451
1
5589-5599
Yes (verified by ORBi)
International
0035-8711
1365-2966
Oxford
United Kingdom
[en] Massive stars ; X-rays ; Stars: early-type ; Stars: binaries ; Space
[en] The long-term (over more than one decade) X-ray emission from two massive
stellar systems known to be particle accelerators is investigated using
XMM-Newton. Their X-ray properties are interpreted taking into account recent
information about their multiplicity and orbital parameters. The two targets,
HD168112 and HD167971 appear to be overluminous in X-rays, lending additional
support to the idea that a significant contribution of the X-ray emission comes
from colliding-wind regions. The variability of the X-ray flux from HD168112 is
interpreted in terms of varying separation expected to follow the 1/D rule for
adiabatic shocked winds. For HD167971, marginal decrease of the X-ray flux in
September 2002 could tentatively be explained by a partial wind eclipse in the
close pair. No long-term variability could be demonstrated despite the
significant difference of separation between 2002 and 2014. This suggests the
colliding-wind region in the wide orbit does not contribute a lot to the total
X-ray emission, with a main contribution coming from the radiative shocked
winds in the eclipsing pair. The later result provides evidence that shocks in
a colliding-wind region may be efficient particle accelerators even in the
absence of bright X-ray emission, suggesting particle acceleration may operate
in a wide range of conditions. Finally, in hierarchical triple O-type systems,
thermal X-rays do not necessarily constitute an efficient tracer to detect the
wind-wind interaction in the long period orbit.
Researchers ; Professionals
http://hdl.handle.net/2268/182374
10.1093/mnras/stv1034
http://mnras.oxfordjournals.org/cgi/content/abstract/stv1034?ijkey=io4zE3wlGQicCOG&keytype=ref

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