Gaulme, P, McKeever, J, Jackiewicz, J, Rawls, ML, Corsaro, E, Mosser, B, Southworth, J, Mahadevan, S, Bender, C and Deshpande, R (2016) Testing The Asteroseismic Scaling Relations For Red Giants With Eclipsing Binaries Observed By Kepler. Astrophysical Journal, 832 (2). p. 121.

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Abstract

Given the potential of ensemble asteroseismology for understanding fundamental properties of large numbers of stars, it is critical to determine the accuracy of the scaling relations on which these measurements are based. From several powerful validation techniques, all indications so far show that stellar radius estimates from the asteroseismic scaling relations are accurate to within a few percent. Eclipsing binary systems hosting at least one star with detectable solar-like oscillations constitute the ideal test objects for validating asteroseismic radius and mass inferences. By combining radial velocity (RV) measurements and photometric time series of eclipses, it is possible to determine the masses and radii of each component of a double-lined spectroscopic binary. We report the results of a four-year RV survey performed with the échelle spectrometer of the Astrophysical Research Consortium's 3.5 m telescope and the APOGEE spectrometer at Apache Point Observatory. We compare the masses and radii of 10 red giants (RGs) obtained by combining radial velocities and eclipse photometry with the estimates from the asteroseismic scaling relations. We find that the asteroseismic scaling relations overestimate RG radii by about 5% on average and masses by about 15% for stars at various stages of RG evolution. Systematic overestimation of mass leads to underestimation of stellar age, which can have important implications for ensemble asteroseismology used for Galactic studies. As part of a second objective, where asteroseismology is used for understanding binary systems, we confirm that oscillations of RGs in close binaries can be suppressed enough to be undetectable, a hypothesis that was proposed in a previous work.

Item Type: Article
Additional Information: This is the final published version of the article (version of record). It first appeared online via IOP Science at http://dx.doi.org/10.3847/0004-637X/832/2/121 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: binaries, eclipsing, stars, evolution, oscillations
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 16 Jan 2017 14:29
Last Modified: 04 Apr 2019 12:35
URI: http://eprints.keele.ac.uk/id/eprint/2782

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