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Testing The Asteroseismic Scaling Relations For Red Giants With Eclipsing Binaries Observed By Kepler

Gaulme, P.; McKeever, J.; Jackiewicz, J.; Rawls, M.L.; Corsaro, E.; Mosser, B.; Southworth, J.; Mahadevan, S.; Bender, C.; Deshpande, R.

Testing The Asteroseismic Scaling Relations For Red Giants With Eclipsing Binaries Observed By Kepler Thumbnail


Authors

P. Gaulme

J. McKeever

J. Jackiewicz

M.L. Rawls

E. Corsaro

B. Mosser

S. Mahadevan

C. Bender

R. Deshpande



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.

Citation

Gaulme, P., McKeever, J., Jackiewicz, J., Rawls, M., Corsaro, E., Mosser, B., …Deshpande, R. (2016). Testing The Asteroseismic Scaling Relations For Red Giants With Eclipsing Binaries Observed By Kepler. Astrophysical Journal, 832(2), Article 121. https://doi.org/10.3847/0004-637X/832/2/121

Journal Article Type Article
Acceptance Date Sep 16, 2016
Online Publication Date Nov 22, 2016
Publication Date Nov 22, 2016
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 832
Issue 2
Article Number 121
DOI https://doi.org/10.3847/0004-637X/832/2/121
Keywords binaries, eclipsing, stars, evolution, oscillations
Publisher URL http://dx.doi.org/10.3847/0004-637X/832/2/121

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