Absolute stellar parameters of KIC 09246715 -- a double-giant eclipsing system with a solar-like oscillator

Abstract

We present our results of a combined analysis of radial velocity and light curves of a double-lined spectroscopic and eclipsing binary KIC 09246715, observed photometrically by the $Kepler$ satellite, and spectroscopically with the OAO-1.88m telescope with the HIgh-Dispertion Echelle Spectrograph (HIDES). The target was claimed to be composed of two red giants, one of which is showing solar-like oscillations. We have found that the mass and radius of the primary are $M_1=2.169\pm 0.024$ M${}_{\odot }$ and $R_1=8.47\pm 0.13$ R${}_{\odot }$, and of the secondary: $M_2=2.143\pm 0.025$ M${}_{\odot }$ and $R_2=8.18\pm 0.09$ R${}_{\odot }$, which confirms the double-giant status. Our secondary is the star to which the oscillations were attributed. Results of its previous asteroseismic analysis are in agreement with ours, only significantly less precise, but the subsequent light-curve-based study failed to derive correct mass and radius of our primary. KIC 09246715 is one of the rare cases where asteroseismic parameters of a solar-like oscillator were confirmed by an independent method, and only the third example of a Galactic double-giant eclipsing binary with masses and radii measured with precision below 2%.

3 figures, 2 tables, accepted by ApJL

References in corpus (3)

• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• Orbital and physical parameters of eclipsing binaries from the ASAS catalogue - VIII. The totally-eclipsing double-giant system HD 187669
• The Araucaria Project. Accurate stellar parameters and distance to evolved eclipsing binary ASAS J180057-2333.8 in Sagittarius Arm

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• DUETS: Setting expectations for asteroseismic binaries and binary products with synthetic populations