Reference : Towards an understanding of the Of ? p star HD 191612: optical spectroscopy
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/1835
Towards an understanding of the Of ? p star HD 191612: optical spectroscopy
English
Howarth, Ian D. [> > > >]
Walborn, Nolan R. [> > > >]
Lennon, Danny J. [> > > >]
Puls, Joachim [> > > >]
Nazé, Yaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Annuk, K. [> > > >]
Antokhin, I. [> > > >]
Bohlender, D. [> > > >]
Bond, H. [> > > >]
Donati, J. F. [> > > >]
Georgiev, L. [> > > >]
Gies, D. [> > > >]
Harmer, D. [> > > >]
Herrero, A. [> > > >]
Kolka, I. [> > > >]
McDavid, D. [> > > >]
Morel, Thierry [Katholieke Universiteit Leuven, Departement Natuurkunde en Sterrenkunde, Instituut voor Sterrenkunde, Celestijnenlaan 200D, 3001 Leuven, Belgium > > > >]
Negueruela, I. [> > > >]
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Reig, P. [> > > >]
21-Oct-2007
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
381
2
433-446
Yes (verified by ORBi)
International
0035-8711
Oxford
[en] stars : binaries : spectroscopic ; stars : early-type ; stars : individual : HD 191612 ; stars : magnetic fields ; stars : rotation
[en] We present extensive optical spectroscopy of the early-type magnetic star HD 191612 (O6.5f ? pe-O8fp). The Balmer and He i lines show strongly variable emission which is highly reproducible on a well-determined 538-d period. He ii absorptions and metal lines (including many selective emission lines but excluding He ii lambda 4686 angstrom emission) are essentially constant in line strength, but are variable in velocity, establishing a double-lined binary orbit with P-orb = 1542 d, e = 0.45. We conduct a model-atmosphere analysis of the spectrum, and find that the system is consistent with a similar to O8 giant with a similar to B1 main-sequence secondary. Since the periodic 538-d changes are unrelated to orbital motion, rotational modulation of a magnetically constrained plasma is strongly favoured as the most likely underlying 'clock'. An upper limit on the equatorial rotation is consistent with this hypothesis, but is too weak to provide a strong constraint.
Researchers ; Professionals
http://hdl.handle.net/2268/1835
10.1111/j.1365-2966.2007.12178.x
http://arxiv.org/abs/0707.0594

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