• DOI:10.1051/0004-6361/200913111
• Corpus ID: 56458774

A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry

@article{Benomar2009AFL,
  title={A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry},
  author={Othman Benomar and Frédéric Baudin and Tiago L. Campante and William J. Chaplin and R. Tom'as Garc'ia and Patrick Gaulme and Thierry Toutain and Graham A. Verner and Thierry Appourchaux and Jérôme Ballot and Caroline Barban and Yvonne P. Elsworth and Savita Mathur and Beno{\^i}t Mosser and Clara R'egulo and Ian W. Roxburgh and Michel Auvergne and Annie Baglin and Claude Catal{\`a} and Eric Michel and R'eza Samadi},
  journal={Astronomy and Astrophysics},
  year={2009},
  volume={507}
}

• O. Benomar, F. Baudin, +18 authors R. Samadi
• Published 16 October 2009
• Physics
• Astronomy and Astrophysics

Context. Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the star HD49933 twice. The oscillation spectrum of this star has proven difficult to interpret. Aims. Thanks to a new timeseries provided by CoRoT, we aim to provide a robust description of the oscillations in HD49933, i.e., to identify the degrees of the observed modes, and to measure mode frequencies, widths, amplitudes and the average rotational splitting. Methods. Several methods were used to model the Fourier spectrum: Maximum Likelihood Estimators and Bayesian analysis using Markov Chain Monte-Carlo techniques. Results. The different methods yield consistent result, and allow us to make a robust identification of the modes and to extract precise mode parameters. Only the rotational splitting remains difficult to estimate precisely, but is clearly relatively large (several μHz in size).