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dc.creatorWade, G. A.-
dc.creatorMaíz Apellaniz, J.-
dc.creatorMartins, F.-
dc.creatorPetit, V.-
dc.creatorGrunhut, J.-
dc.creatorWalborn, N. R.-
dc.creatorBarba, Rodolfo Hector-
dc.creatorGagné, M.-
dc.creatorGarcía Melendo, E.-
dc.creatorJose, J.-
dc.creatorMoffat, A. F. J.-
dc.creatorNaze, Y.-
dc.creatorNeiner, C.-
dc.creatorPellerin, A.-
dc.creatorPenades Ordaz, M.-
dc.creatorShultz, M.-
dc.creatorSimon Díaz, S.-
dc.creatorSota, A.-
dc.creatorMiMeS Collaboration-
dc.date2016-07-22T18:40:34Z-
dc.date2016-07-22T18:40:34Z-
dc.date2012-09-
dc.date2016-04-01T17:19:39Z-
dc.date.accessioned2019-04-29T15:49:30Z-
dc.date.available2019-04-29T15:49:30Z-
dc.date.issued2012-09-
dc.identifierWade, 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.identifier0035-8711-
dc.identifierhttp://hdl.handle.net/11336/6636-
dc.identifier.urihttp://rodna.bn.gov.ar:8080/jspui/handle/bnmm/303031-
dc.descriptionThis 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*.-
dc.descriptionFil: Wade, G. A.. Royal Military College of Canada. Department of Physics; Canadá-
dc.descriptionFil: Maíz Apellaniz, J.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España-
dc.descriptionFil: Martins, F.. Universite Montpellier Ii; Francia-
dc.descriptionFil: Petit, V.. West Chester University. Department of Geology & Astronomy; Estados Unidos-
dc.descriptionFil: Grunhut, J.. Royal Military College of Canada. Department of Physics; Canadá-
dc.descriptionFil: Walborn, N. R.. Space Telescope Science Institute; Estados Unidos-
dc.descriptionFil: 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-
dc.descriptionFil: Gagné, M. . West Chester University. Department of Geology & Astronomy; Estados Unidos-
dc.descriptionFil: García Melendo, E.. Fundacio Privada Observatori Esteve Duran; España. Consejo Superior de Investigaciones Científicas. Institut de Ciencies de l’Espai; España-
dc.descriptionFil: Jose, J.. Indian Institute of Astrophysics; India-
dc.descriptionFil: Moffat, A. F. J.. University Of Montreal; Canadá-
dc.descriptionFil: Naze, Y.. Universite de Liege; Bélgica-
dc.descriptionFil: Neiner, C.. Universite Paris Diderot - Paris 7; Francia-
dc.descriptionFil: Pellerin, A.. Texas A&M University. Department of Physics and Astronomy; Estados Unidos-
dc.descriptionFil: Penades Ordaz, M.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España-
dc.descriptionFil: Shultz, M.. Royal Military College of Canada. Department of Physics; Canadá-
dc.descriptionFil: Simon Díaz, S.. Instituto de Astrofisica de Canarias; España-
dc.descriptionFil: Sota, A.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España-
dc.descriptionFil: MiMeS Collaboration.-
dc.formatapplication/pdf-
dc.formatapplication/pdf-
dc.languageeng-
dc.publisherOxford University Press-
dc.relationinfo:eu-repo/semantics/altIdentifier/url/http://mnras.oxfordjournals.org/content/425/2/1278-
dc.relationinfo:eu-repo/semantics/altIdentifier/arxiv/1206.2834v3-
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1206.2834v3-
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/j.1365-2966.2012.21523.x-
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2012.21523.x-
dc.rightsinfo:eu-repo/semantics/openAccess-
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/-
dc.sourcereponame:CONICET Digital (CONICET)-
dc.sourceinstname:Consejo Nacional de Investigaciones Científicas y Técnicas-
dc.sourceinstacron:CONICET-
dc.subjectBINARIES: SPECTROSCOPIC-
dc.subjectEARLY-TYPE STARS-
dc.subjectSTARS: MAGNETIC FIELDS-
dc.subjectSTARS: NGC1624-2-
dc.subjectAstronomía-
dc.subjectCiencias Físicas-
dc.subjectCIENCIAS NATURALES Y EXACTAS-
dc.titleNGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field-
dc.typeinfo:eu-repo/semantics/article-
dc.typeinfo:eu-repo/semantics/publishedVersion-
dc.typeinfo:ar-repo/semantics/articulo-
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