Reference : Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/132498
Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317
English
Pápics, P. I. [Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium]
Briquet, Maryline mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Baglin, A. [Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, CEA, IRFU, SAp, centre de Saclay, 91191, Gif-sur-Yvette, France]
Poretti, E. [INAF - Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807, Merate (LC), Italy]
Aerts, C. [Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium; Department of Astrophysics, IMAPP, University of Nijmegen, PO Box 9010, 6500 GL, Nijmegen, The Netherlands]
Degroote, P. [Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium]
Tkachenko, A. [Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium]
Morel, Thierry [Université de Liège - ULg > > GAPHE : Astrophysique observationnelle (sol et espace) >]
Zima, W. [Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium]
Niemczura, E. [Instytut Astronomiczny, Uniwersytet Wroclawski, Kopernika 11, 51-622, Wroclaw, Poland]
Rainer, M. [INAF - Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807, Merate (LC), Italy]
Hareter, M. [Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, 1180, Vienna, Austria]
Baudin, F. [Institut d'Astrophysique Spatiale, CNRS/Univ. Paris-Sud, Bât. 121, 91405, Orsay Cedex, France]
Catala, C. [LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France]
Samadi, R. [LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France]
Auvergne, M. [LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France)]
Michel, E. []
1-Jun-2012
Astronomy and Astrophysics
EDP Sciences
542
55
Yes (verified by ORBi)
0004-6361
1432-0746
Les Ulis
France
[en] asteroseismology ; stars: variables: general ; stars: abundances ; stars: oscillations ; stars: individual: HD 43317 ; stars: rotation
[en] Context. OB stars are important building blocks of the Universe, but we have only a limited sample of them well understood enough from an asteroseismological point of view to provide feedback on the current evolutionary models. Our study adds one special case to this sample, with more observational constraints than for most of these stars. <BR /> Aims: Our goal is to analyse and interpret the pulsational behaviour of the B3 IV star HD 43317 using the CoRoT light curve along with the ground-based spectroscopy gathered by the HARPS instrument. This way we continue our efforts to map the β Cep and SPB instability strips. <BR /> Methods: We used different techniques to reveal the abundances and fundamental stellar parameters from the newly-obtained high-resolution spectra. We used various time-series analysis tools to explore the nature of variations present in the light curve. We calculated the moments and used the pixel-by-pixel method to look for line profile variations in the high-resolution spectra. <BR /> Results: We find that HD 43317 is a single fast rotator (v[SUB]rot[/SUB] ≈ 50% v[SUB]crit[/SUB]) and hybrid SPB/β Cep-type pulsator with Solar metal abundances. We interpret the variations in photometry and spectroscopy as a result of rotational modulation connected to surface inhomogeneities, combined with the presence of both g and p mode pulsations. We detect a series of ten consecutive frequencies with an almost constant period spacing of 6339 s as well as a second shorter sequence consisting of seven frequencies with a spacing of 6380 s. The dominant frequencies fall in the regime of gravito-inertial modes. The CoRoT space mission was developed and is operated by the French space agency CNES, with participation of ESA's RSSD and Science Programmes, Austria, Belgium, Brazil, Germany, and Spain.Based on data gathered with HARPS installed on the 3.6 m ESO telescope (ESO Large Programme 182.D-0356) at La Silla, Chile.Table A.1 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/542/A55">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/542/A55</A>
http://hdl.handle.net/2268/132498
10.1051/0004-6361/201218809
http://adsabs.harvard.edu/abs/2012A%26A...542A..55P
http://de.arxiv.org/abs/1203.5231

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