Reference : Towards an understanding of the Of ? p star HD 191612: phase-resolved multiwavelength ob...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/1883
Towards an understanding of the Of ? p star HD 191612: phase-resolved multiwavelength observations
English
Nazé, Yaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Pollock, A. M. T. [> > > >]
Walborn, N. R. [> > > >]
Howarth, I. D. [> > > >]
11-Feb-2007
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
375
1
145-153
Yes (verified by ORBi)
International
0035-8711
Oxford
[en] stars : early-type ; stars : individual : HD 191612 ; X-rays : individual : HD 191612 ; X-rays : stars
[en] We present the analysis of phase-resolved X-ray and optical observations of the peculiar hot star HD 191612 (Of ? p). This star is known to display line-profile variations that are recurrent with a period of 538 d and its spectrum was found to present the signature of a magnetic field. In the X-rays, it is slightly overluminous compared to the canonical L-X/L-BOL) relation and appears brighter when the optical lines are strongest. Our XMM-Newton observations further reveal that the X-ray spectrum of HD 191612 exhibits rather broad lines and is dominated by a 'cool' (0.2-0.6 keV) thermal component, two characteristics at odds with the proposed magnetic rotator model. We also report for the first time the low-level variability of the metallic (absorption/emission) lines and He ii absorptions that appear to be associated with radial-velocity shifts. Finally, we compare our results with observations of the early-type stars and discuss several possible scenarios.
Researchers ; Professionals
http://hdl.handle.net/2268/1883
10.1111/j.1365-2966.2006.11270.x
http://arxiv.org/abs/astro-ph/0611230

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