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dc.contributor.author
Wade, G. A.  
dc.contributor.author
Maíz Apellaniz, J.  
dc.contributor.author
Martins, F.  
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Petit, V.  
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Grunhut, J.  
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Walborn, N. R.  
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Barba, Rodolfo Hector  
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Gagné, M.  
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García Melendo, E.  
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Jose, J.  
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Moffat, A. F. J.  
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Naze, Y.  
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Neiner, C.  
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Pellerin, A.  
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Penades Ordaz, M.  
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Shultz, M.  
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Simon Díaz, S.  
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Sota, A.  
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MiMeS Collaboration  
dc.date.available
2016-07-22T18:40:34Z  
dc.date.issued
2012-09  
dc.identifier.citation
Wade, G. A.; Maíz Apellaniz, J.; Martins, F.; Petit, V.; Grunhut, J.; et al.; NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 425; 2; 9-2012; 1278-1293  
dc.identifier.issn
0035-8711  
dc.identifier.uri
http://hdl.handle.net/11336/6636  
dc.description.abstract
This paper presents a first observational investigation of the faint Of?p star NGC 1624-2, yielding important new constraints on its spectral and physical characteristics, rotation, magnetic field strength, X-ray emission and magnetospheric properties. Modelling the spectrum and spectral energy distribution, we conclude that NGC 1624-2 is a main-sequence star of mass M ≃ 30 Msun, and infer an effective temperature of 35 ± 2 kK and log g = 4.0 ± 0.2. Based on an extensive time series of optical spectral observations we report significant variability of a large number of spectral lines, and infer a unique period of 157.99 ± 0.94 d which we interpret as the rotational period of the star. We report the detection of a very strong (5.35 ± 0.5 kG) longitudinal magnetic field <Bz>, coupled with probable Zeeman splitting of the Stokes I profiles of metal lines confirming a surface field modulus of 14 ± 1 kG, consistent with a surface dipole of polar strength ≳20 kG. This is the largest magnetic field ever detected in an O-type star, and the first report of Zeeman splitting of Stokes I profiles in such an object. We also report the detection of reversed Stokes V profiles associated with weak, high-excitation emission lines of O III, which we propose may form in the close magnetosphere of the star. We analyse archival Chandra ACIS-I X-ray data, inferring a very hard spectrum with an X-ray efficiency of log Lx/Lbol = -6.4, a factor of 4 larger than the canonical value for O-type stars and comparable to that of the young magnetic O-type star θ1 Ori C and other Of?p stars. Finally, we examine the probable magnetospheric properties of the star, reporting in particular very strong magnetic confinement of the stellar wind, with η* ≃ 1.5 × 104, and a very large Alfvén radius, RAlf = 11.4 R*.  
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application/pdf  
dc.language.iso
eng  
dc.publisher
Oxford University Press  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Binaries: Spectroscopic  
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Early-Type Stars  
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Stars: Magnetic Fields  
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Stars: Ngc1624-2  
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Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2016-04-01T17:19:39Z  
dc.journal.volume
425  
dc.journal.number
2  
dc.journal.pagination
1278-1293  
dc.journal.pais
Reino Unido  
dc.journal.ciudad
Oxford  
dc.conicet.avisoEditorial
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2012 The authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved  
dc.description.fil
Fil: Wade, G. A.. Royal Military College of Canada. Department of Physics; Canadá  
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Fil: Maíz Apellaniz, J.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España  
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Fil: Martins, F.. Universite Montpellier Ii; Francia  
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Fil: Petit, V.. West Chester University. Department of Geology & Astronomy; Estados Unidos  
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Fil: Grunhut, J.. Royal Military College of Canada. Department of Physics; Canadá  
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Fil: Walborn, N. R.. Space Telescope Science Institute; Estados Unidos  
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Fil: Barba, Rodolfo Hector. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina  
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Fil: Gagné, M. . West Chester University. Department of Geology & Astronomy; Estados Unidos  
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Fil: García Melendo, E.. Fundacio Privada Observatori Esteve Duran; España. Consejo Superior de Investigaciones Científicas. Institut de Ciencies de l’Espai; España  
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Fil: Jose, J.. Indian Institute of Astrophysics; India  
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Fil: Moffat, A. F. J.. University Of Montreal; Canadá  
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Fil: Naze, Y.. Universite de Liege; Bélgica  
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Fil: Neiner, C.. Universite Paris Diderot - Paris 7; Francia  
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Fil: Pellerin, A.. Texas A&M University. Department of Physics and Astronomy; Estados Unidos  
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Fil: Penades Ordaz, M.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España  
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Fil: Shultz, M.. Royal Military College of Canada. Department of Physics; Canadá  
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Fil: Simon Díaz, S.. Instituto de Astrofisica de Canarias; España  
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Fil: Sota, A.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España  
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Fil: MiMeS Collaboration.  
dc.journal.title
Monthly Notices of the Royal Astronomical Society  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://mnras.oxfordjournals.org/content/425/2/1278  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1206.2834v3  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/arxiv/1206.2834v3  
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info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2012.21523.x  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/j.1365-2966.2012.21523.x