[en] <BR /> Aims: Using the CoRoT space based photometry of the O-type binary HD 46149, stellar atmospheric effects related to rotation can be separated from pulsations, because they leave distinct signatures in the light curve. This offers the possibility of characterising and exploiting any pulsations seismologically. <BR /> Methods: Combining high-quality space based photometry, multi-wavelength photometry, spectroscopy and constraints imposed by binarity and cluster membership, the detected pulsations in HD 46149 are analyzed and compared with those for a grid of stellar evolutionary models in a proof-of-concept approach. <BR /> Results: We present evidence of solar-like oscillations in a massive O-type star, and show that the observed frequency range and spacings are compatible with theoretical predictions. Thus, we unlock and confirm the strong potential of this seismically unexplored region in the HR diagram. 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 observations made with the ESO telescopes at La Silla Observatory under the ESO Large Programme LP182.D-0356.Based on observations made with the Mercator Telescope, operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Degroote, P.; Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium
Briquet, Maryline ; Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium
Auvergne, M.; LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Denis Diderot, 5 place J. Janssen, 92105 Meudon, France
Simón-Díaz, S.; Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
Aerts, C.; Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium ; Department of Astrophysics, IMAPP, University of Nijmegen, PO Box 9010,6500 GL Nijmegen, The Netherlands
Noels-Grötsch, Arlette ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Rainer, M.; INAF - Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy
Hareter, M.; Institut für Astronomie, Universität Wien Türkenschanzstrasse 17, 1180Vienna, Austria
Poretti, E.; INAF - Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy
Mahy, Laurent ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique observationnelle (sol et espace)
Oreiro, R.; Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium
Vučković, M.; Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium
Smolders, K.; Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium
Baglin, A.; LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Denis Diderot, 5 place J. Janssen, 92105 Meudon, France
Baudin, F.; Institut d'Astrophysique Spatiale, CNRS/Université Paris XI UMR 8617, 91405 Orsay, France
Catala, C.; LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Denis Diderot, 5 place J. Janssen, 92105 Meudon, France
Michel, E.
Samadi, R.; LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Denis Diderot, 5 place J. Janssen, 92105 Meudon, France
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