Study of HD 169392A observed by CoRoT and HARPS

S. Mathur, H. Bruntt, C. Catala, Othman Benomar, G. R. Davies, R. A. García, D. Salabert, J. Ballot, B. Mosser, C. Régulo, W. J. Chaplin, Y. Elsworth, R. Handberg, S. Hekker, L. Mantegazza, E. Michel, E. Poretti, M. Rainer, I. W. Roxburgh, R. SamadiM. Stȩlicki, K. Uytterhoeven, G. A. Verner, M. Auvergne, A. Baglin, S. Barceló Forteza, F. Baudin, T. Roca Cortés

Research output: Contribution to journalArticle

Abstract

Context. The results obtained by asteroseismology with data from space missions such as CoRoT and Kepler are providing new insights into stellar evolution. After five years of observations, CoRoT is continuing to provide high-quality data and we here present an analysis of the CoRoT observations of the double star HD 169392, complemented by ground-based spectroscopic observations. Aims. This work aims at characterising the fundamental parameters of the two stars, their chemical composition, the acoustic-mode global parameters including their individual frequencies, and their dynamics. Methods. We analysed HARPS observations of the two stars to derive their chemical compositions. Several methods were used and compared to determine the global properties of stars' acoustic modes and their individual frequencies from the photometric data of CoRoT. Results. The new spectroscopic observations and archival astrometric values suggest that HD 169392 is a weakly bound wide binary system. We obtained spectroscopic parameters for both components which suggest that they originate from the same interstellar cloud. However, only the signature of oscillation modes of HD 169392 A was measured; the signal-to-noise ratio of the modes in HD 169392B is too low to allow any confident detection. For HD 169392 A we were able to extract parameters of modes for = 0, 1, 2, and 3. The analysis of splittings and inclination angle gives two possible solutions: one with with splittings and inclination angles of 0.4-1.0 μHz and 20-40°, the other with 0.2-0.5 μHz and 55-86°. Modelling this star using the Asteroseismic Modeling Portal (AMP) gives a mass of 1.15 ± 0.01 M·, a radius of 1.88 ± 0.02 R·, and an age of 4.33 ± 0.12 Gyr. The uncertainties come from estimated errors on the observables but do not include uncertainties on the surface layer correction or the physics of stellar models.

Original languageEnglish (US)
Article numberA12
JournalAstronomy and Astrophysics
Volume549
DOIs
StatePublished - Dec 12 2012

Fingerprint

stars
acoustics
chemical composition
inclination
asteroseismology
double stars
data quality
stellar models
signal-to-noise ratio
modeling
stellar evolution
space missions
surface layer
physics
oscillation
surface layers
signal to noise ratios
signatures
parameter
oscillations

Keywords

  • Asteroseismology
  • Methods: data analysis
  • Stars: individual: HD 169392
  • Stars: oscillations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Mathur, S., Bruntt, H., Catala, C., Benomar, O., Davies, G. R., García, R. A., ... Roca Cortés, T. (2012). Study of HD 169392A observed by CoRoT and HARPS. Astronomy and Astrophysics, 549, [A12]. https://doi.org/10.1051/0004-6361/201219678

Study of HD 169392A observed by CoRoT and HARPS. / Mathur, S.; Bruntt, H.; Catala, C.; Benomar, Othman; Davies, G. R.; García, R. A.; Salabert, D.; Ballot, J.; Mosser, B.; Régulo, C.; Chaplin, W. J.; Elsworth, Y.; Handberg, R.; Hekker, S.; Mantegazza, L.; Michel, E.; Poretti, E.; Rainer, M.; Roxburgh, I. W.; Samadi, R.; Stȩlicki, M.; Uytterhoeven, K.; Verner, G. A.; Auvergne, M.; Baglin, A.; Barceló Forteza, S.; Baudin, F.; Roca Cortés, T.

In: Astronomy and Astrophysics, Vol. 549, A12, 12.12.2012.

Research output: Contribution to journalArticle

Mathur, S, Bruntt, H, Catala, C, Benomar, O, Davies, GR, García, RA, Salabert, D, Ballot, J, Mosser, B, Régulo, C, Chaplin, WJ, Elsworth, Y, Handberg, R, Hekker, S, Mantegazza, L, Michel, E, Poretti, E, Rainer, M, Roxburgh, IW, Samadi, R, Stȩlicki, M, Uytterhoeven, K, Verner, GA, Auvergne, M, Baglin, A, Barceló Forteza, S, Baudin, F & Roca Cortés, T 2012, 'Study of HD 169392A observed by CoRoT and HARPS', Astronomy and Astrophysics, vol. 549, A12. https://doi.org/10.1051/0004-6361/201219678
Mathur S, Bruntt H, Catala C, Benomar O, Davies GR, García RA et al. Study of HD 169392A observed by CoRoT and HARPS. Astronomy and Astrophysics. 2012 Dec 12;549. A12. https://doi.org/10.1051/0004-6361/201219678
Mathur, S. ; Bruntt, H. ; Catala, C. ; Benomar, Othman ; Davies, G. R. ; García, R. A. ; Salabert, D. ; Ballot, J. ; Mosser, B. ; Régulo, C. ; Chaplin, W. J. ; Elsworth, Y. ; Handberg, R. ; Hekker, S. ; Mantegazza, L. ; Michel, E. ; Poretti, E. ; Rainer, M. ; Roxburgh, I. W. ; Samadi, R. ; Stȩlicki, M. ; Uytterhoeven, K. ; Verner, G. A. ; Auvergne, M. ; Baglin, A. ; Barceló Forteza, S. ; Baudin, F. ; Roca Cortés, T. / Study of HD 169392A observed by CoRoT and HARPS. In: Astronomy and Astrophysics. 2012 ; Vol. 549.
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author = "S. Mathur and H. Bruntt and C. Catala and Othman Benomar and Davies, {G. R.} and Garc{\'i}a, {R. A.} and D. Salabert and J. Ballot and B. Mosser and C. R{\'e}gulo and Chaplin, {W. J.} and Y. Elsworth and R. Handberg and S. Hekker and L. Mantegazza and E. Michel and E. Poretti and M. Rainer and Roxburgh, {I. W.} and R. Samadi and M. Stȩlicki and K. Uytterhoeven and Verner, {G. A.} and M. Auvergne and A. Baglin and {Barcel{\'o} Forteza}, S. and F. Baudin and {Roca Cort{\'e}s}, T.",
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AU - Mathur, S.

AU - Bruntt, H.

AU - Catala, C.

AU - Benomar, Othman

AU - Davies, G. R.

AU - García, R. A.

AU - Salabert, D.

AU - Ballot, J.

AU - Mosser, B.

AU - Régulo, C.

AU - Chaplin, W. J.

AU - Elsworth, Y.

AU - Handberg, R.

AU - Hekker, S.

AU - Mantegazza, L.

AU - Michel, E.

AU - Poretti, E.

AU - Rainer, M.

AU - Roxburgh, I. W.

AU - Samadi, R.

AU - Stȩlicki, M.

AU - Uytterhoeven, K.

AU - Verner, G. A.

AU - Auvergne, M.

AU - Baglin, A.

AU - Barceló Forteza, S.

AU - Baudin, F.

AU - Roca Cortés, T.

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N2 - Context. The results obtained by asteroseismology with data from space missions such as CoRoT and Kepler are providing new insights into stellar evolution. After five years of observations, CoRoT is continuing to provide high-quality data and we here present an analysis of the CoRoT observations of the double star HD 169392, complemented by ground-based spectroscopic observations. Aims. This work aims at characterising the fundamental parameters of the two stars, their chemical composition, the acoustic-mode global parameters including their individual frequencies, and their dynamics. Methods. We analysed HARPS observations of the two stars to derive their chemical compositions. Several methods were used and compared to determine the global properties of stars' acoustic modes and their individual frequencies from the photometric data of CoRoT. Results. The new spectroscopic observations and archival astrometric values suggest that HD 169392 is a weakly bound wide binary system. We obtained spectroscopic parameters for both components which suggest that they originate from the same interstellar cloud. However, only the signature of oscillation modes of HD 169392 A was measured; the signal-to-noise ratio of the modes in HD 169392B is too low to allow any confident detection. For HD 169392 A we were able to extract parameters of modes for = 0, 1, 2, and 3. The analysis of splittings and inclination angle gives two possible solutions: one with with splittings and inclination angles of 0.4-1.0 μHz and 20-40°, the other with 0.2-0.5 μHz and 55-86°. Modelling this star using the Asteroseismic Modeling Portal (AMP) gives a mass of 1.15 ± 0.01 M·, a radius of 1.88 ± 0.02 R·, and an age of 4.33 ± 0.12 Gyr. The uncertainties come from estimated errors on the observables but do not include uncertainties on the surface layer correction or the physics of stellar models.

AB - Context. The results obtained by asteroseismology with data from space missions such as CoRoT and Kepler are providing new insights into stellar evolution. After five years of observations, CoRoT is continuing to provide high-quality data and we here present an analysis of the CoRoT observations of the double star HD 169392, complemented by ground-based spectroscopic observations. Aims. This work aims at characterising the fundamental parameters of the two stars, their chemical composition, the acoustic-mode global parameters including their individual frequencies, and their dynamics. Methods. We analysed HARPS observations of the two stars to derive their chemical compositions. Several methods were used and compared to determine the global properties of stars' acoustic modes and their individual frequencies from the photometric data of CoRoT. Results. The new spectroscopic observations and archival astrometric values suggest that HD 169392 is a weakly bound wide binary system. We obtained spectroscopic parameters for both components which suggest that they originate from the same interstellar cloud. However, only the signature of oscillation modes of HD 169392 A was measured; the signal-to-noise ratio of the modes in HD 169392B is too low to allow any confident detection. For HD 169392 A we were able to extract parameters of modes for = 0, 1, 2, and 3. The analysis of splittings and inclination angle gives two possible solutions: one with with splittings and inclination angles of 0.4-1.0 μHz and 20-40°, the other with 0.2-0.5 μHz and 55-86°. Modelling this star using the Asteroseismic Modeling Portal (AMP) gives a mass of 1.15 ± 0.01 M·, a radius of 1.88 ± 0.02 R·, and an age of 4.33 ± 0.12 Gyr. The uncertainties come from estimated errors on the observables but do not include uncertainties on the surface layer correction or the physics of stellar models.

KW - Asteroseismology

KW - Methods: data analysis

KW - Stars: individual: HD 169392

KW - Stars: oscillations

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