Asteroseismology of twoKeplerdetached eclipsing binaries

Abstract

The present work contains light curve, spectroscopic, and asteroseismic analyses for KIC 04851217 and KIC 10686876. These systems are detached eclipsing binaries hosting a pulsating component of δ Scuti type and have been observed with the unprecedented accuracy of the Kepler space telescope. Using ground-based spectroscopic observations, the spectral types of the primary components of the systems were estimated as A6V and A5V for KIC 04851217 and KIC 10686876, respectively, with an uncertainty of one subclass. The present spectral classification, together with literature radial velocity curves, were used to model the light curves of the systems and, therefore, to calculate the absolute parameters of their components with a higher degree of certainty. The photometric data were analysed using standard eclipsing binary modeling techniques, while their residuals were further analysed using Fourier transformation techniques to extract the pulsation frequencies of their host δ Scuti stars. The oscillation modes of the independent frequencies were identified using theoretical models of δ Scuti stars. The distances of the systems were calculated using the relation between the luminosity and the pulsation period for δ Scuti stars. Here, the physical and the oscillation properties of the pulsating components of these systems are discussed and compared with others of the same type. Moreover, using all the currently known cases of δ Scuti stars in detached binaries, updated correlations between orbital and dominant pulsation periods and between log g and pulsation periods are derived. It can concluded that the proximity of the companion plays significant role in the evolution of the pulsational frequencies.

Space-Based Photometry Of Binary Stars: From Voyager To TESS

“…δ Scuti oscillations have been found in the Kepler light curve of other binary systems, e.g. KIC 3858884 (Maceroni et al [221]), KIC 4544587 (Hambleton et al [222]), KIC 10736223 (Chen et al [223]), KIC 4851217 and KIC 10686876 (Liakos et al [224]).…”

Space-Based Photometry of Binary Stars: From Voyager to TESS

“…The properties of the system could only be matched by theoretical models accounting for binarity and with an enhanced opacity at several regions in the primary star. δ Scuti oscillations have been found in the Kepler light curve of other binary systems, e.g., KIC 3858884 (Maceroni et al [221]), KIC 4544587 (Hambleton et al [222]), KIC 10736223 (Chen et al [223]), KIC 4851217 and KIC 10686876 (Liakos et al [224]).…”

Asteroseismic Analysis of $δ$ Scuti Components of Binary systems: The Case of KIC 8504570

“…The analyses of Kepler LCs for EBs require special handling due to light variations caused by magnetic spots between successive LCs [c.f. 32,39,40]. The latter justifies our choice not to model all the available points folded into the P orb , but to model each LC separately.…”

“…Murphy et al [28], based on a sample of 2224 Kepler δ Scuti light curves, employed the pulsations timing technique [29][30][31] and identified 341 new binaries with long P orb (> 100 d) that 1 http://alexiosliakos.weebly.com/catalogue.html host a δ Scuti component. Liakos [32], using recently discovered systems, presented updated correlations between P pul − P orb and P pul − log g for close (i.e. P orb < 13 d) detached eclipsing binaries with a δ Scuti component.…”

“…The present work is a series paper on individual EBs with a δ Scuti component [see also 24,32,[36][37][38][39][40]. The system KIC 8504570 was selected for the present work because its pulsational behaviour is currently unknown to the community and its detailed analysis contributes to the sample of Kepler detached binaries with a δ Scuti member (27 systems in total published to date; see Liakos and Niarchos [26] and updated lists in Liakos [32]).…”