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Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452

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Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452

dc.contributor.author	Neiner, C.
dc.contributor.author	Floquet, M.
dc.contributor.author	Samadi, R.
dc.contributor.author	Espinosa-Lara, F.
dc.contributor.author	Frémat, Y.
dc.contributor.author	Mathis, S.
dc.contributor.author	Leroy, B.
dc.contributor.author	De Batz, B.
dc.contributor.author	Rainer, M.
dc.contributor.author	Poretti, E.
dc.contributor.author	Mathias, P.
dc.contributor.author	Guarro Fló, J.
dc.contributor.author	Buil, C.
dc.contributor.author	Ribeiro, J.
dc.contributor.author	Alecian, E.
dc.contributor.author	Andrade, L.
dc.contributor.author	Briquet, M.
dc.contributor.author	Diago Nebot, Pascual David
dc.contributor.author	Emilio, M.
dc.contributor.author	Fabregat Llueca, Juan
dc.contributor.author	Gutiérrez Soto, Juan
dc.contributor.author	Hubert, A.M.
dc.contributor.author	Janot-Pacheco, E.
dc.contributor.author	Martayan, C.
dc.contributor.author	Semaan, T.
dc.contributor.author	Suso, J.
dc.contributor.author	Zorec, J.
dc.date.accessioned	2015-10-20T14:00:34Z
dc.date.available	2015-10-20T14:00:34Z
dc.date.issued	2012
dc.identifier.citation	Neiner, C. Floquet, M. Samadi, R. Espinosa Lara, F. Frémat, Y. Mathis, S. Leroy, B. De Batz, B. Rainer, M. Poretti, E. Mathias, P. Guarro Fló, J. Buil, C. Ribeiro, J. Alecian, E. Andrade, L. Briquet, M. Diago, P. D. Emilio, M. Fabregat, J. Gutiérrez-Soto, J. Hubert, A.-M. Janot-Pacheco, E. Martayan, C. Semaan, T. Suso, J. Zorec, J. 2012 Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452 Astronomy and Astrophysics 546 A47
dc.identifier.uri	http://hdl.handle.net/10550/47829
dc.description.abstract	Context.Be stars are rapidly rotating stars with a circumstellar decretion disk. They usually undergo pressure and/or gravity pulsation modes excited by the κ-mechanism, i.e. an effect of the opacity of iron-peak elements in the envelope of the star. In the Milky Way,p-modes are observed in stars that are hotter than or equal to the B3 spectral type, while g-modes are observed at the B2 spectral type and cooler.Aims.We observed a B0IVe star, HD 51452,with the high-precision, high-cadence photometric CoRoT satellite and high-resolution, ground-based HARPS and SOPHIE spectrographs to study its pulsations in great detail. We also used the lower resolution spectra available in the BeSS atabase. Methods.We analyzed the CoRoT and spectroscopic data with several methods: Clean -NG, Freq Find, and a sliding window method.We also analyzed spectral quantities, such as the violet over red (V/R) emission variations, to obtain information about the variation in the circumstellar environment. We calculated a stellar structure model with the ESTER code to test the various interpretation of the results.Results.We detect 189 frequencies of variations in the CoRoT light curve in the range between 0 and 4.5 c d−1. The main frequencies are also recovered in the spectroscopic data. In particular we find that HD 51452 undergoes gravito-inertial modes that are not in the domain of those excited by the κ-mechanism. We propose that these are stochastic modes excited in the convective zones and that at least some of them are a multiplet of r-modes (i.e. subinertial modes mainly driven by the Coriolis acceleration). Stochastically excited gravito-inertial modes had never been observed in any star, and theory predicted that their very low amplitudes would be undetectable even with CoRoT. We suggest that the amplitudes are enhanced in HD 51452 because of the very rapid stellar rotation.In addition, we find that the amplitude variations of these modes are related to the occurrence of minor outbursts.Conclusions.Thanks to CoRoT data, we have detected a new kind of pulsations in HD 51452, which are stochastically excited gravito-inertial modes, probably due to its very rapid rotation. These modes are probably also present in other rapidly rotating hot Be stars.
dc.language.iso	eng
dc.relation.ispartof	Astronomy and Astrophysics, 2012, vol. 546, p. A47
dc.subject	Ciència Ensenyament
dc.subject	Partícules (Física nuclear)
dc.title	Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452
dc.type	journal article	es_ES
dc.date.updated	2015-10-20T14:00:35Z
dc.identifier.idgrec	107397
dc.rights.accessRights	open access	es_ES