The pulsations of the B5IVe star HD 181 231 observed with CoRoT and ground-based spectroscopy
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The pulsations of the B5IVe star HD 181 231 observed with CoRoT and ground-based spectroscopy

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The pulsations of the B5IVe star HD 181 231 observed with CoRoT and ground-based spectroscopy

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dc.contributor.author Neiner, C.
dc.contributor.author Gutiérrez Soto, Juan
dc.contributor.author Baudin, F.
dc.contributor.author De Batz, B.
dc.contributor.author Frémat, Y.
dc.contributor.author Huat, A. L.
dc.contributor.author Floquet, M.
dc.contributor.author Hubert, A. M.
dc.contributor.author Leroy, B.
dc.contributor.author Diago Nebot, Pascual David
dc.contributor.author Poretti, E.
dc.contributor.author Carrier, F.
dc.contributor.author Rainer, M.
dc.contributor.author Catala, C.
dc.contributor.author Thizy, O.
dc.contributor.author Buil, C.
dc.contributor.author Ribeiro, J.
dc.contributor.author Andrade, L.
dc.contributor.author Emilio, M.
dc.contributor.author Espinosa-Lara, F.
dc.contributor.author Fabregat Llueca, Juan
dc.contributor.author Janot-Pacheco, E.
dc.contributor.author Martayan, C.
dc.contributor.author Semaan, T.
dc.contributor.author Suso, J.
dc.contributor.author Baglin, A.
dc.contributor.author Michel, E.
dc.contributor.author Samadi, R.
dc.date.accessioned 2015-10-16T17:21:44Z
dc.date.available 2015-10-16T17:21:44Z
dc.date.issued 2009
dc.identifier.uri http://hdl.handle.net/10550/47750
dc.description.abstract Context. HD 181231 is a B5IVe star, which has been observed with the CoRoT satellite during ∼5 consecutive months and simultaneously from the ground in spectroscopy and spectropolarimetry. Aims. By analysing these data, we aim to detect and characterize as many pulsation frequencies as possible, to search for the presence of beating effects possibly at the origin of the Be phenomenon. Our results will also pr ovide a basis for seismic modelling. Methods. The fundamental parameters of the star are determined from spectral fitting and from the study of the circumstellar emission. The CoRoT photometric data and ground-based spectroscopy are analysed using several Fourier Techniques: CLEAN-NG,PASPER,and TISAFT, as well as a time-frequency technique. A search for a magnetic field is performed by applying the LSD technique to the spectropolarimetric data. Results. We find that HD 181231 is a B5IVe star seen with an inclination of ∼45 degrees. No magnetic field is detected in its photo-sphere. We detect at least 10 independent significant frequencies of variations among the 54 detected frequencies, interpreted in termsof non-radial pulsation modes and rotation. Two longer-term variations are also detected: one at ∼14 days resulting from a beating effect between the two main frequencies of short-term variations, the other at ∼116 days due either to a beating of frequencies or to a zonal pulsation mode. Conclusions. Our analysis of the CoRoT light curve and ground-based spectroscopic data of HD 181231 has led to the determination of the fundamental and pulsational parameters of the star, including beating effects. This will allow a precise seismic modelling of this star.
dc.language.iso eng
dc.relation.ispartof Astronomy and Astrophysics, 2009
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Neiner, C. Gutierrez Soto, Juan Baudin, F. De Batz, B. Frémat, Y. Huat, A.L. Floquet, M. Hubert, A.M. Leroy, B. Diago Nebot, Pascual David Poretti, E. Carrier, F. Rainer, M. Catala, C. Thizy, O. Buil, C. Ribeiro, J. Andrade, L. Emilio, M. Espinosa-Lara, F. Fabregat Llueca, Juan Janot-Pacheco, E. Martayan, C. Semaan, T. Suso, J. Baglin, A. Michel, E. Samadi, R. 2009 The pulsations of the B5IVe star HD 181 231 observed with CoRoT and ground-based spectroscopy Astronomy and Astrophysics
dc.subject Astronomia
dc.subject Ciència Ensenyament
dc.title The pulsations of the B5IVe star HD 181 231 observed with CoRoT and ground-based spectroscopy
dc.type info:eu-repo/semantics/article
dc.date.updated 2015-10-16T17:21:44Z
dc.identifier.idgrec 048712

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