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Paper: On the Amplitude of Solar-like Oscillations of Red Giants in Eclipsing Binaries
Volume: 478, Fifty Years of Seismology of the Sun and Stars
Page: 391
Authors: Gaulme, P.; Jackiewicz, J.
Abstract: Red-giant stars are proving to be fundamental for testing models of stellar evolution, as asteroseismology has opened up a window into their interiors. Such insights are a direct result of the unprecedented data from the space missions CoRoT and Kepler, which allow the use of well-known but unvalidated asteroseismic scaling laws to determine a star's mass and radius from rather simple light-curve analysis. Eclipsing binaries are also fundamental astrophysical objects, and when coupled with asteroseismology, can provide two independent methods to obtain masses and radii and exciting opportunities to develop highly constrained stellar models. Gaulme et al. (2013) reported the discovery of 11 bona fide new candidates to be eclipsing binaries, one to be a heartbeat star, and 10 more to be hierarchical triple systems, all of which include a pulsating red giant. They also reported the identification of five systems whose light curves are typical of eclipsing binary systems composed of a red giant and a main sequence star, but where no solar-like oscillations are detected. We find that the red giants with the strongest photometric variability do not display acoustic oscillations, and that a strong relation between the lack of modes and the systems with the shortest orbital periods, largest relative radii, and lowest eccentricities can be established.
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