2009/06/22 by P. Degroote, M. Briquet, C. Catala +8 · 127 citations
Mathematics · Physics and Astronomy · #Amplitude #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Excited state #Light curve #Mathematics #Mode coupling #Nonlinear system #Optics #Photometry (optics) #Physics #Quantum mechanics #Spectral density #Stars #Statistical physics #Statistics #Stellar, planetary, and galactic studies #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361/200911782
published in Astronomy and Astrophysics 506(1), 111-123 (EDP Sciences) · 13 pages, 12 figures, accepted for publication in A&A, 27 may 2009
arxiv created 2009/06/22 · openalex publication_date 2009/07/09 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
<i>Context. <i/>We present the CoRoT light curve of the Cep star HD 180642, assembled during the first long run of the space mission, as well as archival single-band photometry.<i>Aims. <i/>Our goal is to analyse the detailed behaviour present in the light curve and interpret it in terms of excited-mode frequencies.<i>Methods. <i/>After describing the noise properties in detail, we use various time series analyses and fitting techniques to model the CoRoT light curve, for various physical assumptions. We apply statistical goodness-of-fit criteria that allow us to select the most appropriate physical model fit to the data.<i>Results. <i/>We conclude that the light-curve model based on nonlinear resonant frequency and phase locking provides the best representation of the data. Interpretation of the residuals is dependent on the chosen physical model used to prewhiten the data.<i>Conclusions. <i/>Our observational results constitute a fruitful starting point for detailed seismic stellar modelling of this large-amplitude and evolved Cep star.