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. KjeldsenC. 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

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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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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.

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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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