Seismology and activity of the F type star HD 49933

Free access article

Issue		A&A Volume 431, Number 2, February IV 2005


Page(s)		L13 - L16
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:200500003

A&A 431, L13-L16 (2005)
DOI: 10.1051/0004-6361:200500003

Letter

Seismology and activity of the F type star HD 49933

B. Mosser¹, F. Bouchy², C. Catala¹, E. Michel¹, R. Samadi¹, F. Thévenin³, P. Eggenberger⁴, D. Sosnowska⁴, C. Moutou² and A. Baglin¹

¹ LESIA, CNRS UMR 8109, Observatoire de Paris, 92195 Meudon Cedex, France
e-mail: benoit.mosser@obspm.fr
² LAM, CNRS UMR 6110, Traverse du Siphon, BP 8, 13376 Marseille Cedex 12, France
³ Laboratoire Cassiopée, CNRS UMR 6202, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France
⁴ Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland

(Received 19 October 2004 / Accepted 11 January 2005 )

Abstract
A 10-night asteroseismic observation programme has been conducted in January 2004 with the spectrometer HARPS at the ES0 3.6-m telescope. The selected target, the 6th magnitude F5V star HD 49933, was chosen among the prime candidates of COROT, the European space mission dedicated to characterize stellar oscillations mode with high precision photometry measurements. This star shows important line profiles variations, indicating a surprisingly high activity with respect to its low rotation rate. However, with the help of tools developed for disentangling the signatures of activity and oscillations, we are able to observe its oscillation spectrum in the frequency range [1.2, 2.2 mHz]. We measure the large separation ( $88.7\pm0.4$ $\mu$ Hz) and the maximum amplitude (around $0.4 \pm 0.1$ m s ^-1 rms), respectively in agreement and marginal agreement with the predicted values.

Key words: techniques: radial velocities -- stars: oscillations

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