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dc.date.accessioned | 2019-11-25T15:01:03Z | |
dc.date.available | 2019-11-25T15:01:03Z | |
dc.date.issued | 2015 | |
dc.identifier.uri | http://sedici.unlp.edu.ar/handle/10915/86059 | |
dc.description.abstract | We 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. | en |
dc.format.extent | 2551-2567 | es |
dc.language | en | es |
dc.subject | 28° 2561 | es |
dc.subject | Stars: individual: CPD | es |
dc.subject | Stars: magnetic field | es |
dc.subject | Stars: massive | es |
dc.subject | Stars: rotation | es |
dc.title | Rotation, spectral variability, magnetic geometry and magnetosphere of the Of?p star CPD -28° 2561 | en |
dc.type | Articulo | es |
sedici.identifier.other | doi:10.1093/mnras/stu2548 | es |
sedici.identifier.other | eid:2-s2.0-84923102565 | es |
sedici.identifier.issn | 0035-8711 | es |
sedici.creator.person | Wade, G. A. | es |
sedici.creator.person | Barbá, Rodolfo Héctor | es |
sedici.creator.person | Grunhut, J. | es |
sedici.creator.person | Martins, F. | es |
sedici.creator.person | Petit, V. | es |
sedici.creator.person | Sundqvist, J. O. | es |
sedici.creator.person | Townsend, R. H. D. | es |
sedici.creator.person | Walborn, N. R. | es |
sedici.creator.person | Alecian, E. | es |
sedici.creator.person | Alfaro, E. J. | es |
sedici.creator.person | Maíz Apellániz, J. | es |
sedici.creator.person | Arias, Julia Inés | es |
sedici.creator.person | Gamen, Roberto Claudio | es |
sedici.creator.person | Morrell, Nidia Irene | es |
sedici.creator.person | Nazé, Y. | es |
sedici.creator.person | Sota, A. | es |
sedici.creator.person | Doula, A. ud | es |
sedici.creator.corporate | MiMeS Collaboration | es |
sedici.description.note | Este documento tiene una corrección (ver documento relacionado). | es |
sedici.subject.materias | Ciencias Astronómicas | es |
sedici.description.fulltext | true | es |
mods.originInfo.place | Instituto de Astrofísica de La Plata | es |
sedici.subtype | Articulo | es |
sedici.rights.license | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
sedici.rights.uri | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
sedici.description.peerReview | peer-review | es |
sedici.relation.journalTitle | Monthly Notices of the Royal Astronomical Society | es |
sedici.relation.journalVolumeAndIssue | vol. 447, no. 3 | es |
sedici.relation.isRelatedWith | http://sedici.unlp.edu.ar/handle/10915/87057 | es |
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