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

O. Benomar; F. Baudin; T. L. Campante; W. J. Chaplin; R. A. García; P. Gaulme; T. Toutain; G. A. Verner; T. Appourchaux; J. Ballot; C. Barban; Y. Elsworth; S. Mathur; B. Mosser; C. Régulo; I. W. Roxburgh; M. Auvergne; A. Baglin; C. Catala; E. Michel; R. Samadi

doi:10.1051/0004-6361/200913111

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

O. Benomar, F. Baudin, T. L. Campante, W. J. Chaplin, R. A. García, P. Gaulme, T. Toutain, G. A. Verner, T. Appourchaux, J. Ballot, C. Barban, Y. Elsworth, S. Mathur, B. Mosser, C. Régulo, I. W. Roxburgh, M. Auvergne, A. Baglin, C. Catala, E. MichelR. Samadi

Center for Space Science

Research output: Contribution to journal › Article › peer-review

Abstract

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).

Original language	English (US)
Pages (from-to)	L13-L16
Journal	Astronomy and Astrophysics
Volume	507
Issue number	1
DOIs	https://doi.org/10.1051/0004-6361/200913111
State	Published - Nov 3 2009

Keywords

Stars: oscillations

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/200913111

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Benomar, O., Baudin, F., Campante, T. L., Chaplin, W. J., García, R. A., Gaulme, P., Toutain, T., Verner, G. A., Appourchaux, T., Ballot, J., Barban, C., Elsworth, Y., Mathur, S., Mosser, B., Régulo, C., Roxburgh, I. W., Auvergne, M., Baglin, A., Catala, C., ... Samadi, R. (2009). A fresh look at the seismic spectrum of HD49933: Analysis of 180 days of CoRoT photometry. Astronomy and Astrophysics, 507(1), L13-L16. https://doi.org/10.1051/0004-6361/200913111

Benomar, O, Baudin, F, Campante, TL, Chaplin, WJ, García, RA, Gaulme, P, Toutain, T, Verner, GA, Appourchaux, T, Ballot, J, Barban, C, Elsworth, Y, Mathur, S, Mosser, B, Régulo, C, Roxburgh, IW, Auvergne, M, Baglin, A, Catala, C, Michel, E & Samadi, R 2009, 'A fresh look at the seismic spectrum of HD49933: Analysis of 180 days of CoRoT photometry', Astronomy and Astrophysics, vol. 507, no. 1, pp. L13-L16. https://doi.org/10.1051/0004-6361/200913111

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title = "A fresh look at the seismic spectrum of HD49933: Analysis of 180 days of CoRoT photometry",

abstract = "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).",

keywords = "Stars: oscillations",

author = "O. Benomar and F. Baudin and Campante, {T. L.} and Chaplin, {W. J.} and Garc{\'i}a, {R. A.} and P. Gaulme and T. Toutain and Verner, {G. A.} and T. Appourchaux and J. Ballot and C. Barban and Y. Elsworth and S. Mathur and B. Mosser and C. R{\'e}gulo and Roxburgh, {I. W.} and M. Auvergne and A. Baglin and C. Catala and E. Michel and R. Samadi",

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doi = "10.1051/0004-6361/200913111",

language = "English (US)",

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T1 - A fresh look at the seismic spectrum of HD49933

T2 - Analysis of 180 days of CoRoT photometry

AU - Benomar, O.

AU - Baudin, F.

AU - Campante, T. L.

AU - Chaplin, W. J.

AU - García, R. A.

AU - Gaulme, P.

AU - Toutain, T.

AU - Verner, G. A.

AU - Appourchaux, T.

AU - Ballot, J.

AU - Barban, C.

AU - Elsworth, Y.

AU - Mathur, S.

AU - Mosser, B.

AU - Régulo, C.

AU - Roxburgh, I. W.

AU - Auvergne, M.

AU - Baglin, A.

AU - Catala, C.

AU - Michel, E.

AU - Samadi, R.

PY - 2009/11/3

Y1 - 2009/11/3

N2 - 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).

AB - 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).

KW - Stars: oscillations

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

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Keywords

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