| Issue |
A&A
Volume 519, September 2010
|
|
|---|---|---|
| Article Number | A38 | |
| Number of page(s) | 10 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/201014543 | |
| Published online | 09 September 2010 | |
Detection of frequency spacings in the young O-type binary HD 46149 from CoRoT photometry *,**,***
1
Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D, 3001
Leuven, Belgium e-mail: pieter.degroote@ster.kuleuven.be
2
LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Denis Diderot, 5 place J. Janssen, 92105 Meudon, France
3
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
4
Departamento de Astrofísica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
5
Department of Astrophysics, IMAPP, University of Nijmegen, PO Box 9010,
6500 GL Nijmegen, The Netherlands
6
Institut d'Astrophysique et de Géophysique Université de Liège,
Allée du 6 août 17, 4000 Liège, Belgium
7
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy
8
Institut für Astronomie, Universität Wien Türkenschanzstrasse 17, 1180
Vienna, Austria
9
Institut d'Astrophysique Spatiale, CNRS/Université Paris XI UMR 8617, 91405 Orsay, France
Received:
30
March
2010
Accepted:
26
May
2010
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.
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.
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.
Key words: binaries: spectroscopic / stars: individual: HD 46149 / stars: massive / stars: oscillations / asteroseismology
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.
© ESO, 2010
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