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dc.creatorWade, G. A.-
dc.creatorBarba, R. H.-
dc.creatorGrunhut, J.-
dc.creatorMartins, F.-
dc.creatorPetit, V.-
dc.creatorSundqvist, J. O.-
dc.creatorTownsend, R. H. D.-
dc.creatorWalborn, N. R.-
dc.creatorAlecian, E.-
dc.creatorAlfaro, E. J.-
dc.creatorMaíz Apellaniz, J-
dc.creatorArias, Julia Ines-
dc.creatorGamen, Roberto Claudio-
dc.creatorMorrell, Nidia Irene-
dc.creatorNaze, Y.-
dc.creatorSota, A-
dc.creatorud-Doula, A.-
dc.creatorMiMeS Collaboration-
dc.date2017-02-09T18:09:56Z-
dc.date2017-02-09T18:09:56Z-
dc.date2015-03-
dc.date2017-01-11T13:26:12Z-
dc.date.accessioned2019-04-29T15:40:17Z-
dc.date.available2019-04-29T15:40:17Z-
dc.date.issued2017-02-09T18:09:56Z-
dc.date.issued2017-02-09T18:09:56Z-
dc.date.issued2015-03-
dc.date.issued2017-01-11T13:26:12Z-
dc.identifierWade, G. A.; Barba, R. H. ; Grunhut, J.; Martins, F.; Petit, V.; et al.; Rotation, spectral variability, magnetic geometry and magnetosphere of the Of?p star CPD -28° 2561; Oxford University Press; Monthly Notices Of The Royal Astronomical Society; 447; 3; 3-2015; 2551-2567-
dc.identifier0035-8711-
dc.identifierhttp://hdl.handle.net/11336/12796-
dc.identifier.urihttp://rodna.bn.gov.ar:8080/jspui/handle/bnmm/299085-
dc.descriptionWe report magnetic and spectroscopic observations and modelling of the Of?p star CPD −28° 2561. Using more than 75 new spectra, we have measured the equivalent width variations and examined the dynamic spectra of photospheric and wind-sensitive spectral lines. A period search results in an unambiguous 73.41 d variability period. High-resolution spectropolarimetric data analysed using least-squares deconvolution yield a Zeeman signature detected in the mean Stokes V profile corresponding to phase 0.5 of the spectral ephemeris. Interpreting the 73.41 d period as the stellar rotational period, we have phased the equivalent widths and inferred longitudinal field measurements. The phased magnetic data exhibit a weak sinusoidal variation, with maximum of about 565 G at phase 0.5, and a minimum of about −335 G at phase 0.0, with extrema approximately in phase with the (double-wave) Hα equivalent width variation. Modelling of the Hα equivalent width variation assuming a quasi-3D magnetospheric model produces a unique solution for the ambiguous couplet of inclination and magnetic obliquity angles: (i, β) or (β, i) = (35°, 90°). Adopting either geometry, the longitudinal field variation yields a dipole polar intensity Bd = 2.6 ± 0.9 kG, consistent with that obtained from direct modelling of the Stokes V profiles. We derive a wind magnetic confinement parameter η* ≃ 100, leading to an Alfvén radius RA ≃ 3–5R*, and a Kepler radius RK ≃ 20R*. This supports a physical scenario in which the Hα emission and other line variability have their origin in an oblique, corotating ‘dynamical magnetosphere’ structure resulting from a magnetically channelled wind. Nevertheless, the details of the formation of spectral lines and their variability within this framework remain generally poorly understood.-
dc.descriptionFil: Wade, G. A.. Royal Military College of Canada. Department of Physics; Canadá-
dc.descriptionFil: Barba, R. H. . Universidad de la Serena; Chile-
dc.descriptionFil: Grunhut, J.. European Southern Observatories; Alemania-
dc.descriptionFil: Martins, F.. Universite Montpellier Ii; Francia-
dc.descriptionFil: Petit, V.. University of Delaware. Department of Physics and Astronomy. Bartol Research Institute; Estados Unidos-
dc.descriptionFil: Sundqvist, J. O. . Institut fur Astronomie und Astrophysik der Universität München; Alemania-
dc.descriptionFil: Townsend, R. H. D. . University of Wisconsin-Madison. Department of Astronomy; Estados Unidos-
dc.descriptionFil: Walborn, N. R. . Space Telescope Science Institute; Estados Unidos-
dc.descriptionFil: Alecian, E.. UJF-Grenoble 1/CNRS-INSU. Institut de Planetologie et d’Astrophysique ´ de Grenoble (IPAG); Francia-
dc.descriptionFil: Alfaro, E. J.. Consejo Superior de Investigaciones Cientificas. Instituto de Astrofísica de Andalucía; España-
dc.descriptionFil: Maíz Apellaniz, J. Consejo Superior de Investigaciones Cientificas. Instituto de Astrofísica de Andalucía; España-
dc.descriptionFil: Arias, Julia Ines. Universidad de la Serena; Chile-
dc.descriptionFil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina-
dc.descriptionFil: Morrell, Nidia Irene. Observatories of the Carnegie Institution of Washington. Las Campanas Observatory; Estados Unidos-
dc.descriptionFil: Naze, Y.. Universitée de Liéege; Bélgica-
dc.descriptionFil: Sota, A. Consejo Superior de Investigaciones Cientificas. Instituto de Astrofísica de Andalucía; España-
dc.descriptionFil: ud-Doula, A.. Penn State Worthington Scranton; Estados Unidos-
dc.descriptionFil: MiMeS Collaboration.-
dc.formatapplication/pdf-
dc.formatapplication/pdf-
dc.languageeng-
dc.publisherOxford University Press-
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stu2548-
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-abstract/447/3/2551/986112/Rotation-spectral-variability-magnetic-geometry?redirectedFrom=fulltext-
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.subjectCPD -28° 2561 (estrella)-
dc.subjectMagnetic fields-
dc.subjectMassive stars-
dc.subjectRotation-
dc.subjectAstronomía-
dc.subjectCiencias Físicas-
dc.subjectCIENCIAS NATURALES Y EXACTAS-
dc.titleRotation, spectral variability, magnetic geometry and magnetosphere of the Of?p star CPD -28° 2561-
dc.typeinfo:eu-repo/semantics/article-
dc.typeinfo:eu-repo/semantics/publishedVersion-
dc.typeinfo:ar-repo/semantics/articulo-
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