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dc.contributor.author
Hubrig, S.
dc.contributor.author
Kholtygin, A. F.
dc.contributor.author
Schöller, M.
dc.contributor.author
Anderson, R. I.
dc.contributor.author
Saesen, S.
dc.contributor.author
Gonzalez, Jorge Federico
dc.contributor.author
Ilyin, I.
dc.contributor.author
Briquet, M.
dc.date.available
2016-03-21T19:58:13Z
dc.date.issued
2015-02
dc.identifier.citation
Hubrig, S.; Kholtygin, A. F.; Schöller, M.; Anderson, R. I.; Saesen, S.; et al.; New spectroscopic and polarimetric observations of the A0 supergiant HD 92207; Wiley; Astronomische Nachrichten; 336; 2; 2-2015; 168-177
dc.identifier.issn
0004-6337
dc.identifier.uri
http://hdl.handle.net/11336/4887
dc.description.abstract
Our recent search for the presence of a magnetic field in the bright earlyA-type supergiant HD92207 using FORS2 in spectropolarimetric mode revealed thepresence of a longitudinal magnetic field of the order of a few hundred Gauss.However, the definite confirmation of the magnetic nature of this objectremained pending due to the detection of short-term spectral variabilityprobably affecting the position of line profiles in left- and right-handpolarized spectra. We present new magnetic field measurements of HD92207obtained on three different epochs in 2013 and 2014 using FORS2 inspectropolarimetric mode. A 3sigma detection of the mean longitudinal magneticfield using the entire spectrum, <B_z>_all=104+-34G, was achieved inobservations obtained in 2014 January. At this epoch, the position of thespectral lines appeared stable. Our analysis of spectral line shapes recordedin opposite circularly polarized light, i.e. in light with opposite sense ofrotation, reveals that line profiles in the light polarized in a certaindirection appear slightly split. The mechanism causing such a behaviour in thecircularly polarized light is currently unknown. Trying to settle the issue ofshort-term variability, we searched for changes in the spectral line profileson a time scale of 8-10min using HARPS polarimetric spectra and on a time scaleof 3-4min using time series obtained with the CORALIE spectrograph. Nosignificant variability was detected on these time scales during the epochsstudied.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Early-Type Stars
dc.subject
Polarimetric
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Atmospheres
dc.subject
Magnetic Fields
dc.subject.classification
Astronomía
dc.subject.classification
Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
New spectroscopic and polarimetric observations of the A0 supergiant HD 92207
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-03-30 10:35:44.97925-03
dc.journal.volume
336
dc.journal.number
2
dc.journal.pagination
168-177
dc.journal.pais
Alemania
dc.journal.ciudad
Weinheim
dc.description.fil
Fil: Hubrig, S.. Leibniz-Institut f¨ur Astrophysik Potsdam; Alemania
dc.description.fil
Fil: Kholtygin, A. F.. Saint-Petersburg State University. Astronomical Institute; Rusia
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Fil: Schöller, M.. European Southern Observatory; Alemania
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Fil: Anderson, R. I.. Geneva University. Geneva Observatory; Suiza. Johns Hopkins University. Department of Physics and Astronomy; Estados Unidos
dc.description.fil
Fil: Saesen, S.. Geneva University. Geneva Observatory; Suiza
dc.description.fil
Fil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
dc.description.fil
Fil: Ilyin, I.. Leibniz-Institut f¨ur Astrophysik Potsdam; Alemania
dc.description.fil
Fil: Briquet, M.. Université de Liège. Institut d’Astrophysique et de Géophysique; Bélgica
dc.journal.title
Astronomische Nachrichten
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/asna.201412150/abstract
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1002/asna.201412150
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://arxiv.org/abs/1502.00227
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