Solar-like oscillations with low amplitude in the CoRoT target HD 181906

R. A. García; C. Régulo; R. Samadi; J. Ballot; C. Barban; O. Benomar; W. J. Chaplin; P. Gaulme; T. Appourchaux; S. Mathur; B. Mosser; T. Toutain; G. A. Verner; M. Auvergne; A. Baglin; F. Baudin; P. Boumier; H. Bruntt; C. Catala; S. Deheuvels; Y. Elsworth; S. J. Jiménez-Reyes; E. Michel; F. Pérez Hernández; I. W. Roxburgh; D. Salabert

doi:10.1051/0004-6361/200911910

Solar-like oscillations with low amplitude in the CoRoT target HD 181906

R. A. García, C. Régulo, R. Samadi, J. Ballot, C. Barban, O. Benomar, W. J. Chaplin, P. Gaulme, T. Appourchaux, S. Mathur, B. Mosser, T. Toutain, G. A. Verner, M. Auvergne, A. Baglin, F. Baudin, P. Boumier, H. Bruntt, C. Catala, S. DeheuvelsY. Elsworth, S. J. Jiménez-Reyes, E. Michel, F. Pérez Hernández, I. W. Roxburgh, D. Salabert

Center for Space Science

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

Abstract

Context. The F8 star HD 181906 (effective temperature ∼6300 K) was observed for 156 days by the CoRoT satellite during the first long run in the direction of the galactic centre. Analysis of the data reveals a spectrum of solar-like acoustic oscillations. However, the faintness of the target (m_ν = 7.65) means the signal-to-noise (S/N) in the acoustic modes is quite low, and this low S/N leads to complications in the analysis. Aims. We extract global variables of the star, as well as key parameters of the p modes observed in the power spectrum of the lightcurve. Methods. The power spectrum of the lightcurve, a wavelet transform and spot fitting were used to obtain the average rotation rate of the star and its inclination angle. Then, the autocorrelation of the power spectrum and the power spectrum of the power spectrum were used to properly determine the large separation. Finally, estimations of the mode parameters were done by maximizing the likelihood of a global fit, where several modes were fit simultaneously. Results. We have been able to infer the mean surface rotation rate of the star (∼4 μHz) with indications of the presence of surface differential rotation, the large separation of the p modes (∼87 μHz), hence also the "ridges" corresponding to overtones of the acoustic modes.

Original language	English (US)
Pages (from-to)	41-50
Number of pages	10
Journal	Astronomy and Astrophysics
Volume	506
Issue number	1
DOIs	https://doi.org/10.1051/0004-6361/200911910
State	Published - 2009

Keywords

Methods: observational
Methods: statistical
Stars: individual: HD 181906
Stars: oscillations

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/200911910

Cite this

García, R. A., Régulo, C., Samadi, R., Ballot, J., Barban, C., Benomar, O., Chaplin, W. J., Gaulme, P., Appourchaux, T., Mathur, S., Mosser, B., Toutain, T., Verner, G. A., Auvergne, M., Baglin, A., Baudin, F., Boumier, P., Bruntt, H., Catala, C., ... Salabert, D. (2009). Solar-like oscillations with low amplitude in the CoRoT target HD 181906. Astronomy and Astrophysics, 506(1), 41-50. https://doi.org/10.1051/0004-6361/200911910

García, RA, Régulo, C, Samadi, R, Ballot, J, Barban, C, Benomar, O, Chaplin, WJ, Gaulme, P, Appourchaux, T, Mathur, S, Mosser, B, Toutain, T, Verner, GA, Auvergne, M, Baglin, A, Baudin, F, Boumier, P, Bruntt, H, Catala, C, Deheuvels, S, Elsworth, Y, Jiménez-Reyes, SJ, Michel, E, Pérez Hernández, F, Roxburgh, IW & Salabert, D 2009, 'Solar-like oscillations with low amplitude in the CoRoT target HD 181906', Astronomy and Astrophysics, vol. 506, no. 1, pp. 41-50. https://doi.org/10.1051/0004-6361/200911910

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title = "Solar-like oscillations with low amplitude in the CoRoT target HD 181906",

abstract = "Context. The F8 star HD 181906 (effective temperature ∼6300 K) was observed for 156 days by the CoRoT satellite during the first long run in the direction of the galactic centre. Analysis of the data reveals a spectrum of solar-like acoustic oscillations. However, the faintness of the target (mν = 7.65) means the signal-to-noise (S/N) in the acoustic modes is quite low, and this low S/N leads to complications in the analysis. Aims. We extract global variables of the star, as well as key parameters of the p modes observed in the power spectrum of the lightcurve. Methods. The power spectrum of the lightcurve, a wavelet transform and spot fitting were used to obtain the average rotation rate of the star and its inclination angle. Then, the autocorrelation of the power spectrum and the power spectrum of the power spectrum were used to properly determine the large separation. Finally, estimations of the mode parameters were done by maximizing the likelihood of a global fit, where several modes were fit simultaneously. Results. We have been able to infer the mean surface rotation rate of the star (∼4 μHz) with indications of the presence of surface differential rotation, the large separation of the p modes (∼87 μHz), hence also the {"}ridges{"} corresponding to overtones of the acoustic modes.",

keywords = "Methods: observational, Methods: statistical, Stars: individual: HD 181906, Stars: oscillations",

author = "Garc{\'i}a, {R. A.} and C. R{\'e}gulo and R. Samadi and J. Ballot and C. Barban and O. Benomar and Chaplin, {W. J.} and P. Gaulme and T. Appourchaux and S. Mathur and B. Mosser and T. Toutain and Verner, {G. A.} and M. Auvergne and A. Baglin and F. Baudin and P. Boumier and H. Bruntt and C. Catala and S. Deheuvels and Y. Elsworth and Jim{\'e}nez-Reyes, {S. J.} and E. Michel and {P{\'e}rez Hern{\'a}ndez}, F. and Roxburgh, {I. W.} and D. Salabert",

note = "Publisher Copyright: {\textcopyright} ESO 2009.",

year = "2009",

doi = "10.1051/0004-6361/200911910",

language = "English (US)",

volume = "506",

pages = "41--50",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

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TY - JOUR

T1 - Solar-like oscillations with low amplitude in the CoRoT target HD 181906

AU - García, R. A.

AU - Régulo, C.

AU - Samadi, R.

AU - Ballot, J.

AU - Barban, C.

AU - Benomar, O.

AU - Chaplin, W. J.

AU - Gaulme, P.

AU - Appourchaux, T.

AU - Mathur, S.

AU - Mosser, B.

AU - Toutain, T.

AU - Verner, G. A.

AU - Auvergne, M.

AU - Baglin, A.

AU - Baudin, F.

AU - Boumier, P.

AU - Bruntt, H.

AU - Catala, C.

AU - Deheuvels, S.

AU - Elsworth, Y.

AU - Jiménez-Reyes, S. J.

AU - Michel, E.

AU - Pérez Hernández, F.

AU - Roxburgh, I. W.

AU - Salabert, D.

PY - 2009

Y1 - 2009

N2 - Context. The F8 star HD 181906 (effective temperature ∼6300 K) was observed for 156 days by the CoRoT satellite during the first long run in the direction of the galactic centre. Analysis of the data reveals a spectrum of solar-like acoustic oscillations. However, the faintness of the target (mν = 7.65) means the signal-to-noise (S/N) in the acoustic modes is quite low, and this low S/N leads to complications in the analysis. Aims. We extract global variables of the star, as well as key parameters of the p modes observed in the power spectrum of the lightcurve. Methods. The power spectrum of the lightcurve, a wavelet transform and spot fitting were used to obtain the average rotation rate of the star and its inclination angle. Then, the autocorrelation of the power spectrum and the power spectrum of the power spectrum were used to properly determine the large separation. Finally, estimations of the mode parameters were done by maximizing the likelihood of a global fit, where several modes were fit simultaneously. Results. We have been able to infer the mean surface rotation rate of the star (∼4 μHz) with indications of the presence of surface differential rotation, the large separation of the p modes (∼87 μHz), hence also the "ridges" corresponding to overtones of the acoustic modes.

AB - Context. The F8 star HD 181906 (effective temperature ∼6300 K) was observed for 156 days by the CoRoT satellite during the first long run in the direction of the galactic centre. Analysis of the data reveals a spectrum of solar-like acoustic oscillations. However, the faintness of the target (mν = 7.65) means the signal-to-noise (S/N) in the acoustic modes is quite low, and this low S/N leads to complications in the analysis. Aims. We extract global variables of the star, as well as key parameters of the p modes observed in the power spectrum of the lightcurve. Methods. The power spectrum of the lightcurve, a wavelet transform and spot fitting were used to obtain the average rotation rate of the star and its inclination angle. Then, the autocorrelation of the power spectrum and the power spectrum of the power spectrum were used to properly determine the large separation. Finally, estimations of the mode parameters were done by maximizing the likelihood of a global fit, where several modes were fit simultaneously. Results. We have been able to infer the mean surface rotation rate of the star (∼4 μHz) with indications of the presence of surface differential rotation, the large separation of the p modes (∼87 μHz), hence also the "ridges" corresponding to overtones of the acoustic modes.

KW - Methods: observational

KW - Methods: statistical

KW - Stars: individual: HD 181906

KW - Stars: oscillations

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U2 - 10.1051/0004-6361/200911910

DO - 10.1051/0004-6361/200911910

M3 - Article

AN - SCOPUS:84969795545

SN - 0004-6361

VL - 506

SP - 41

EP - 50

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 1

ER -

Solar-like oscillations with low amplitude in the CoRoT target HD 181906

Abstract

Keywords

ASJC Scopus subject areas

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