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Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175 869

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Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175 869

dc.contributor.author	Gutiérrez Soto, Juan
dc.contributor.author	Floquet, M.
dc.contributor.author	Samadi, R.
dc.contributor.author	Neiner, C.
dc.contributor.author	Garrido, R.
dc.contributor.author	Fabregat Llueca, Juan
dc.contributor.author	Frémat, Y.
dc.contributor.author	Diago Nebot, Pascual David
dc.contributor.author	Huat, A. L.
dc.contributor.author	Leroy, B.
dc.contributor.author	Emilio, M.
dc.contributor.author	Hubert, A.M.
dc.contributor.author	Thizy, O.
dc.contributor.author	Andrade, L.
dc.contributor.author	De Batz, B.
dc.contributor.author	Janot-Pacheco, E.
dc.contributor.author	Espinosa-Lara, F.
dc.contributor.author	Martayan, C.
dc.contributor.author	Suso, J.
dc.contributor.author	Auvergne, M.
dc.contributor.author	Chaintreuil, S.
dc.contributor.author	Michel, E.
dc.contributor.author	Catala, C.
dc.date.accessioned	2015-10-15T18:11:24Z
dc.date.available	2015-10-15T18:11:24Z
dc.date.issued	2009
dc.identifier.citation	Gutierrez Soto, Juan Floquet, M. Samadi, R. Neiner, C. Garrido, R. Fabregat, J. Frémat, Y. Diago, P.D. Huat, A. L. Leroy, B. Emilio, M. Hubert, A. M. Thizy, O. Andrade, L. De Batz, B. Janot-Pacheco, E. Espinosa -Lara, F. Martayan, C. Suso, J. Auvergne, M. Chaintreuil, S. Michel, E. Catala, C. 2009 Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175 869 Astronomy and Astrophysics
dc.identifier.uri	http://hdl.handle.net/10550/47714
dc.description.abstract	Context.The origin of the short-term variability in Be stars remains a matter of controversy. Pulsations and rotational modulation are the components of the favored hypothesis.Aims.We present our analysis of CoRoT data of the B8IIIe star HD 175869 observed during the first short run in the center direction (SRC1).Methods.We review both the instrumental effects visible in the CoRoT light curve and the analysis methods used by the CoRoT Be team. We applied these methods to the CoRoT light curve of the star HD 175869. A search for line-profile variations in the spectroscopic data was also performed. We also searched for a magnetic field, by applying the LSD technique to spectropolarimetric data.Results.The light curve exhibits low-amplitude variations of the order of 300 μ mag with a double wave shape. A frequency within the range determined for the rotational frequency and 6 of its harmonics are detected. The main frequency and its first harmonic exhibit amplitude variations of a few days. Other significant frequencies of low-amplitude from 25 to a few μmag are also found. The analysis of line profiles from ground-based spectrosc opic data does not detect an y variation. In addition, no Zeeman signature was found.Conclusions.Inhomogeneities caused by stellar activity in or just above the photosphere are proposed to produce the photometric variability detected by CoRoT in the Be star HD 175869. The hypothesis that non-radial pulsations are the origin of these variations cannot be excluded.
dc.language.iso	eng
dc.relation.ispartof	Astronomy and Astrophysics, 2009
dc.subject	Esteroides
dc.title	Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175 869
dc.type	journal article	es_ES
dc.date.updated	2015-10-15T18:11:25Z
dc.identifier.idgrec	048711
dc.rights.accessRights	open access	es_ES