CoRoT sounds the stars

P-mode parameters of Sun-like oscillations on HD 49933

T. Appourchaux, E. Michel, M. Auvergne, A. Baglin, T. Toutain, F. Baudin, Othman Benomar, W. J. Chaplin, S. Deheuvels, R. Samadi, G. A. Verner, P. Boumier, R. A. García, B. Mosser, J. C. Hulot, J. Ballot, C. Barban, Y. Elsworth, S. J. Jiménez-Reyes, H. Kjeldsen & 2 others C. Régulo, I. W. Roxburgh

    Research output: Contribution to journalArticle

    Abstract

    Context: The first asteroseismology results from CoRoT are presented, on a star showing Sun-like oscillations. We have analyzed a 60 day lightcurve of high-quality photometric data collected by CoRoT on the F5 V star HD 49933. The data reveal a rich spectrum of overtones of low-degree p modes. Aims: Our aim was to extract robust estimates of the key parameters of the p modes observed in the power spectrum of the lightcurve. Methods: Estimation of the mode parameters was performed using maximum likelihood estimation of the power spectrum. A global fitting strategy was adopted whereby 15 mode orders of the mode spectrum (45 modes) were fitted simultaneously. Results: The parameter estimates that we list include mode frequencies, peak linewidths, mode amplitudes, and a mean rotational frequency splitting. We find that the average large frequency (overtone) spacing derived from the fitted mode frequencies is 85.9 0.15 Hz. The frequency of maximum amplitude of the radial modes is at 1760 Hz, where the observed rms mode amplitude is 3.75 0.23 ppm. The mean rotational splitting of the non-radial modes appears to be in the range 2.7 Hz to 3.4 Hz. The angle of inclination offered by the star, as determined by fits to the amplitude ratios of the modes, appears to be in the range degrees to degrees..

    Original languageEnglish (US)
    Pages (from-to)705-714
    Number of pages10
    JournalAstronomy and Astrophysics
    Volume488
    Issue number2
    DOIs
    StatePublished - Sep 1 2008

    Fingerprint

    sun
    oscillation
    stars
    oscillations
    acoustics
    estimation method
    data quality
    spacing
    sound
    parameter
    power spectra
    asteroseismology
    harmonics
    estimates
    lists
    inclination

    Keywords

    • Methods: observational
    • Methods: statistical
    • Stars: oscillations

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Appourchaux, T., Michel, E., Auvergne, M., Baglin, A., Toutain, T., Baudin, F., ... Roxburgh, I. W. (2008). CoRoT sounds the stars: P-mode parameters of Sun-like oscillations on HD 49933. Astronomy and Astrophysics, 488(2), 705-714. https://doi.org/10.1051/0004-6361:200810297

    CoRoT sounds the stars : P-mode parameters of Sun-like oscillations on HD 49933. / Appourchaux, T.; Michel, E.; Auvergne, M.; Baglin, A.; Toutain, T.; Baudin, F.; Benomar, Othman; Chaplin, W. J.; Deheuvels, S.; Samadi, R.; Verner, G. A.; Boumier, P.; García, R. A.; Mosser, B.; Hulot, J. C.; Ballot, J.; Barban, C.; Elsworth, Y.; Jiménez-Reyes, S. J.; Kjeldsen, H.; Régulo, C.; Roxburgh, I. W.

    In: Astronomy and Astrophysics, Vol. 488, No. 2, 01.09.2008, p. 705-714.

    Research output: Contribution to journalArticle

    Appourchaux, T, Michel, E, Auvergne, M, Baglin, A, Toutain, T, Baudin, F, Benomar, O, Chaplin, WJ, Deheuvels, S, Samadi, R, Verner, GA, Boumier, P, García, RA, Mosser, B, Hulot, JC, Ballot, J, Barban, C, Elsworth, Y, Jiménez-Reyes, SJ, Kjeldsen, H, Régulo, C & Roxburgh, IW 2008, 'CoRoT sounds the stars: P-mode parameters of Sun-like oscillations on HD 49933', Astronomy and Astrophysics, vol. 488, no. 2, pp. 705-714. https://doi.org/10.1051/0004-6361:200810297
    Appourchaux T, Michel E, Auvergne M, Baglin A, Toutain T, Baudin F et al. CoRoT sounds the stars: P-mode parameters of Sun-like oscillations on HD 49933. Astronomy and Astrophysics. 2008 Sep 1;488(2):705-714. https://doi.org/10.1051/0004-6361:200810297
    Appourchaux, T. ; Michel, E. ; Auvergne, M. ; Baglin, A. ; Toutain, T. ; Baudin, F. ; Benomar, Othman ; Chaplin, W. J. ; Deheuvels, S. ; Samadi, R. ; Verner, G. A. ; Boumier, P. ; García, R. A. ; Mosser, B. ; Hulot, J. C. ; Ballot, J. ; Barban, C. ; Elsworth, Y. ; Jiménez-Reyes, S. J. ; Kjeldsen, H. ; Régulo, C. ; Roxburgh, I. W. / CoRoT sounds the stars : P-mode parameters of Sun-like oscillations on HD 49933. In: Astronomy and Astrophysics. 2008 ; Vol. 488, No. 2. pp. 705-714.
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    abstract = "Context: The first asteroseismology results from CoRoT are presented, on a star showing Sun-like oscillations. We have analyzed a 60 day lightcurve of high-quality photometric data collected by CoRoT on the F5 V star HD 49933. The data reveal a rich spectrum of overtones of low-degree p modes. Aims: Our aim was to extract robust estimates of the key parameters of the p modes observed in the power spectrum of the lightcurve. Methods: Estimation of the mode parameters was performed using maximum likelihood estimation of the power spectrum. A global fitting strategy was adopted whereby 15 mode orders of the mode spectrum (45 modes) were fitted simultaneously. Results: The parameter estimates that we list include mode frequencies, peak linewidths, mode amplitudes, and a mean rotational frequency splitting. We find that the average large frequency (overtone) spacing derived from the fitted mode frequencies is 85.9 0.15 Hz. The frequency of maximum amplitude of the radial modes is at 1760 Hz, where the observed rms mode amplitude is 3.75 0.23 ppm. The mean rotational splitting of the non-radial modes appears to be in the range 2.7 Hz to 3.4 Hz. The angle of inclination offered by the star, as determined by fits to the amplitude ratios of the modes, appears to be in the range degrees to degrees..",
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    T1 - CoRoT sounds the stars

    T2 - P-mode parameters of Sun-like oscillations on HD 49933

    AU - Appourchaux, T.

    AU - Michel, E.

    AU - Auvergne, M.

    AU - Baglin, A.

    AU - Toutain, T.

    AU - Baudin, F.

    AU - Benomar, Othman

    AU - Chaplin, W. J.

    AU - Deheuvels, S.

    AU - Samadi, R.

    AU - Verner, G. A.

    AU - Boumier, P.

    AU - García, R. A.

    AU - Mosser, B.

    AU - Hulot, J. C.

    AU - Ballot, J.

    AU - Barban, C.

    AU - Elsworth, Y.

    AU - Jiménez-Reyes, S. J.

    AU - Kjeldsen, H.

    AU - Régulo, C.

    AU - Roxburgh, I. W.

    PY - 2008/9/1

    Y1 - 2008/9/1

    N2 - Context: The first asteroseismology results from CoRoT are presented, on a star showing Sun-like oscillations. We have analyzed a 60 day lightcurve of high-quality photometric data collected by CoRoT on the F5 V star HD 49933. The data reveal a rich spectrum of overtones of low-degree p modes. Aims: Our aim was to extract robust estimates of the key parameters of the p modes observed in the power spectrum of the lightcurve. Methods: Estimation of the mode parameters was performed using maximum likelihood estimation of the power spectrum. A global fitting strategy was adopted whereby 15 mode orders of the mode spectrum (45 modes) were fitted simultaneously. Results: The parameter estimates that we list include mode frequencies, peak linewidths, mode amplitudes, and a mean rotational frequency splitting. We find that the average large frequency (overtone) spacing derived from the fitted mode frequencies is 85.9 0.15 Hz. The frequency of maximum amplitude of the radial modes is at 1760 Hz, where the observed rms mode amplitude is 3.75 0.23 ppm. The mean rotational splitting of the non-radial modes appears to be in the range 2.7 Hz to 3.4 Hz. The angle of inclination offered by the star, as determined by fits to the amplitude ratios of the modes, appears to be in the range degrees to degrees..

    AB - Context: The first asteroseismology results from CoRoT are presented, on a star showing Sun-like oscillations. We have analyzed a 60 day lightcurve of high-quality photometric data collected by CoRoT on the F5 V star HD 49933. The data reveal a rich spectrum of overtones of low-degree p modes. Aims: Our aim was to extract robust estimates of the key parameters of the p modes observed in the power spectrum of the lightcurve. Methods: Estimation of the mode parameters was performed using maximum likelihood estimation of the power spectrum. A global fitting strategy was adopted whereby 15 mode orders of the mode spectrum (45 modes) were fitted simultaneously. Results: The parameter estimates that we list include mode frequencies, peak linewidths, mode amplitudes, and a mean rotational frequency splitting. We find that the average large frequency (overtone) spacing derived from the fitted mode frequencies is 85.9 0.15 Hz. The frequency of maximum amplitude of the radial modes is at 1760 Hz, where the observed rms mode amplitude is 3.75 0.23 ppm. The mean rotational splitting of the non-radial modes appears to be in the range 2.7 Hz to 3.4 Hz. The angle of inclination offered by the star, as determined by fits to the amplitude ratios of the modes, appears to be in the range degrees to degrees..

    KW - Methods: observational

    KW - Methods: statistical

    KW - Stars: oscillations

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