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

Solar-like oscillations have been observed by Kepler and CoRoT in many solar-type stars, thereby providing a way to probe stars using asteroseismology. 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-s...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2015-10, Vol.582, p.1-19
Main Authors: Appourchaux, T, Antia, H M, Ball, W, Creevey, O, Lebreton, Y, Verma, K, Vorontsov, S, Campante, T L, Davies, G R, Gaulme, R
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Derivation
Double stars
Mathematical models
Physics
Separation
Stars
Stellar age
Time series
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Summary:Solar-like oscillations have been observed by Kepler and CoRoT in many solar-type stars, thereby providing a way to probe stars using asteroseismology. 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 (HIP 93511), for which an interferometric orbit has been observed along with asteroseismic measurements. 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 modeling, the mode frequencies allowed us to derive the radius, the mass, and the age of each component.
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361/201526610