A seismic and gravitationally bound double star observed by Kepler: Implication for the presence of a convective core

T. Appourchaux; H. M. Antia; W. Ball; O. Creevey; Y. Lebreton; K. Verma; S. Vorontsov; T. L. Campante; G. R. Davies; P. Gaulme; C. Régulo; E. Horch; S. Howell; M. Everett; D. Ciardi; L. Fossati; A. Miglio; J. Montalbán; W. J. Chaplin; R. A. García; L. Gizon

doi:10.1051/0004-6361/201526610

A seismic and gravitationally bound double star observed by Kepler: Implication for the presence of a convective core

T. Appourchaux, H. M. Antia, W. Ball, O. Creevey, Y. Lebreton, K. Verma, S. Vorontsov, T. L. Campante, G. R. Davies, P. Gaulme, C. Régulo, E. Horch, S. Howell, M. Everett, D. Ciardi, L. Fossati, A. Miglio, J. Montalbán, W. J. Chaplin, R. A. GarcíaL. Gizon

Center for Space Science

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

Abstract

Context. Solar-like oscillations have been observed by Kepler and CoRoT in many solar-type stars, thereby providing a way to probe stars using asteroseismology. Aims. The derivation of stellar parameters has usually been done with single stars. The aim of the paper is to derive the stellar parameters of a double-star system (HIP93511), for which an interferometric orbit has been observed along with asteroseismic measurements. Methods. We used a time series of nearly two years of data for the double star to detect the two oscillation-mode envelopes that appear in the power spectrum. Using a new scaling relation based on luminosity, we derived the radius and mass of each star. We derived the age of each star using two proxies: one based upon the large frequency separation and a new one based upon the small frequency separation. Using stellar modelling, the mode frequencies allowed us to derive the radius, the mass, and the age of each component. In addition, speckle interferometry performed since 2006 has enabled us to recover the orbit of the system and the total mass of the system. Results. From the determination of the orbit, the total mass of the system is 2.34_-0.33 ^+0.45 M_⊙. The total seismic mass using scaling relations is 2.47 ± 0.07 M_⊙. The seismic age derived using the new proxy based upon the small frequency separation is 3.5 ± 0.3 Gyr. Based on stellar modelling, the mean common age of the system is 2.7-3.9 Gyr. The mean total seismic mass of the system is 2.34-2.53 M_⊙ consistent with what we determined independently with the orbit. The stellar models provide the mean radius, mass, and age of the stars as R_A = 1.82-1.87R_⊙, M_A = 1.25-1.39 M_⊙, Age_A = 2.6-3.5 Gyr; R_B = 1.22-1.25 R_⊙, M_B = 1.08-1.14 M_⊙, Age_B = 3.35-4.21 Gyr. The models provide two sets of values for Star A: [1.25-1.27] M_⊙ and [1.34-1.39] M_⊙. We detect a convective core in Star A, while Star B does not have any. For the metallicity of the binary system of Z ≈ 0.02, we set the limit between stars having a convective core in the range [1.14-1.25] M_⊙.

Original language	English (US)
Article number	A25
Journal	Astronomy and Astrophysics
Volume	582
DOIs	https://doi.org/10.1051/0004-6361/201526610
State	Published - Oct 1 2015

Keywords

asteroseismology
astrometry
binaries: general
stars: evolution
stars: solar-type

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1051/0004-6361/201526610

Cite this

Appourchaux, T., Antia, H. M., Ball, W., Creevey, O., Lebreton, Y., Verma, K., Vorontsov, S., Campante, T. L., Davies, G. R., Gaulme, P., Régulo, C., Horch, E., Howell, S., Everett, M., Ciardi, D., Fossati, L., Miglio, A., Montalbán, J., Chaplin, W. J., ... Gizon, L. (2015). A seismic and gravitationally bound double star observed by Kepler: Implication for the presence of a convective core. Astronomy and Astrophysics, 582, Article A25. https://doi.org/10.1051/0004-6361/201526610

Appourchaux, T, Antia, HM, Ball, W, Creevey, O, Lebreton, Y, Verma, K, Vorontsov, S, Campante, TL, Davies, GR, Gaulme, P, Régulo, C, Horch, E, Howell, S, Everett, M, Ciardi, D, Fossati, L, Miglio, A, Montalbán, J, Chaplin, WJ, García, RA & Gizon, L 2015, 'A seismic and gravitationally bound double star observed by Kepler: Implication for the presence of a convective core', Astronomy and Astrophysics, vol. 582, A25. https://doi.org/10.1051/0004-6361/201526610

@article{5bfc765f1ab947899b705ddc3b1d36fb,

title = "A seismic and gravitationally bound double star observed by Kepler: Implication for the presence of a convective core",

abstract = "Context. Solar-like oscillations have been observed by Kepler and CoRoT in many solar-type stars, thereby providing a way to probe stars using asteroseismology. Aims. The derivation of stellar parameters has usually been done with single stars. The aim of the paper is to derive the stellar parameters of a double-star system (HIP93511), for which an interferometric orbit has been observed along with asteroseismic measurements. Methods. We used a time series of nearly two years of data for the double star to detect the two oscillation-mode envelopes that appear in the power spectrum. Using a new scaling relation based on luminosity, we derived the radius and mass of each star. We derived the age of each star using two proxies: one based upon the large frequency separation and a new one based upon the small frequency separation. Using stellar modelling, the mode frequencies allowed us to derive the radius, the mass, and the age of each component. In addition, speckle interferometry performed since 2006 has enabled us to recover the orbit of the system and the total mass of the system. Results. From the determination of the orbit, the total mass of the system is 2.34-0.33 +0.45 M⊙. The total seismic mass using scaling relations is 2.47 ± 0.07 M⊙. The seismic age derived using the new proxy based upon the small frequency separation is 3.5 ± 0.3 Gyr. Based on stellar modelling, the mean common age of the system is 2.7-3.9 Gyr. The mean total seismic mass of the system is 2.34-2.53 M⊙ consistent with what we determined independently with the orbit. The stellar models provide the mean radius, mass, and age of the stars as RA = 1.82-1.87R⊙, MA = 1.25-1.39 M⊙, AgeA = 2.6-3.5 Gyr; RB = 1.22-1.25 R⊙, MB = 1.08-1.14 M⊙, AgeB = 3.35-4.21 Gyr. The models provide two sets of values for Star A: [1.25-1.27] M⊙ and [1.34-1.39] M⊙. We detect a convective core in Star A, while Star B does not have any. For the metallicity of the binary system of Z ≈ 0.02, we set the limit between stars having a convective core in the range [1.14-1.25] M⊙.",

keywords = "asteroseismology, astrometry, binaries: general, stars: evolution, stars: solar-type",

author = "T. Appourchaux and Antia, {H. M.} and W. Ball and O. Creevey and Y. Lebreton and K. Verma and S. Vorontsov and Campante, {T. L.} and Davies, {G. R.} and P. Gaulme and C. R{\'e}gulo and E. Horch and S. Howell and M. Everett and D. Ciardi and L. Fossati and A. Miglio and J. Montalb{\'a}n and Chaplin, {W. J.} and Garc{\'i}a, {R. A.} and L. Gizon",

note = "Publisher Copyright: {\textcopyright} ESO, 2015.",

year = "2015",

month = oct,

day = "1",

doi = "10.1051/0004-6361/201526610",

language = "English (US)",

volume = "582",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - A seismic and gravitationally bound double star observed by Kepler

T2 - Implication for the presence of a convective core

AU - Appourchaux, T.

AU - Antia, H. M.

AU - Ball, W.

AU - Creevey, O.

AU - Lebreton, Y.

AU - Verma, K.

AU - Vorontsov, S.

AU - Campante, T. L.

AU - Davies, G. R.

AU - Gaulme, P.

AU - Régulo, C.

AU - Horch, E.

AU - Howell, S.

AU - Everett, M.

AU - Ciardi, D.

AU - Fossati, L.

AU - Miglio, A.

AU - Montalbán, J.

AU - Chaplin, W. J.

AU - García, R. A.

AU - Gizon, L.

PY - 2015/10/1

Y1 - 2015/10/1

N2 - Context. Solar-like oscillations have been observed by Kepler and CoRoT in many solar-type stars, thereby providing a way to probe stars using asteroseismology. Aims. The derivation of stellar parameters has usually been done with single stars. The aim of the paper is to derive the stellar parameters of a double-star system (HIP93511), for which an interferometric orbit has been observed along with asteroseismic measurements. Methods. We used a time series of nearly two years of data for the double star to detect the two oscillation-mode envelopes that appear in the power spectrum. Using a new scaling relation based on luminosity, we derived the radius and mass of each star. We derived the age of each star using two proxies: one based upon the large frequency separation and a new one based upon the small frequency separation. Using stellar modelling, the mode frequencies allowed us to derive the radius, the mass, and the age of each component. In addition, speckle interferometry performed since 2006 has enabled us to recover the orbit of the system and the total mass of the system. Results. From the determination of the orbit, the total mass of the system is 2.34-0.33 +0.45 M⊙. The total seismic mass using scaling relations is 2.47 ± 0.07 M⊙. The seismic age derived using the new proxy based upon the small frequency separation is 3.5 ± 0.3 Gyr. Based on stellar modelling, the mean common age of the system is 2.7-3.9 Gyr. The mean total seismic mass of the system is 2.34-2.53 M⊙ consistent with what we determined independently with the orbit. The stellar models provide the mean radius, mass, and age of the stars as RA = 1.82-1.87R⊙, MA = 1.25-1.39 M⊙, AgeA = 2.6-3.5 Gyr; RB = 1.22-1.25 R⊙, MB = 1.08-1.14 M⊙, AgeB = 3.35-4.21 Gyr. The models provide two sets of values for Star A: [1.25-1.27] M⊙ and [1.34-1.39] M⊙. We detect a convective core in Star A, while Star B does not have any. For the metallicity of the binary system of Z ≈ 0.02, we set the limit between stars having a convective core in the range [1.14-1.25] M⊙.

AB - Context. Solar-like oscillations have been observed by Kepler and CoRoT in many solar-type stars, thereby providing a way to probe stars using asteroseismology. Aims. The derivation of stellar parameters has usually been done with single stars. The aim of the paper is to derive the stellar parameters of a double-star system (HIP93511), for which an interferometric orbit has been observed along with asteroseismic measurements. Methods. We used a time series of nearly two years of data for the double star to detect the two oscillation-mode envelopes that appear in the power spectrum. Using a new scaling relation based on luminosity, we derived the radius and mass of each star. We derived the age of each star using two proxies: one based upon the large frequency separation and a new one based upon the small frequency separation. Using stellar modelling, the mode frequencies allowed us to derive the radius, the mass, and the age of each component. In addition, speckle interferometry performed since 2006 has enabled us to recover the orbit of the system and the total mass of the system. Results. From the determination of the orbit, the total mass of the system is 2.34-0.33 +0.45 M⊙. The total seismic mass using scaling relations is 2.47 ± 0.07 M⊙. The seismic age derived using the new proxy based upon the small frequency separation is 3.5 ± 0.3 Gyr. Based on stellar modelling, the mean common age of the system is 2.7-3.9 Gyr. The mean total seismic mass of the system is 2.34-2.53 M⊙ consistent with what we determined independently with the orbit. The stellar models provide the mean radius, mass, and age of the stars as RA = 1.82-1.87R⊙, MA = 1.25-1.39 M⊙, AgeA = 2.6-3.5 Gyr; RB = 1.22-1.25 R⊙, MB = 1.08-1.14 M⊙, AgeB = 3.35-4.21 Gyr. The models provide two sets of values for Star A: [1.25-1.27] M⊙ and [1.34-1.39] M⊙. We detect a convective core in Star A, while Star B does not have any. For the metallicity of the binary system of Z ≈ 0.02, we set the limit between stars having a convective core in the range [1.14-1.25] M⊙.

KW - asteroseismology

KW - astrometry

KW - binaries: general

KW - stars: evolution

KW - stars: solar-type

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A seismic and gravitationally bound double star observed by Kepler: Implication for the presence of a convective core

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