Asteroseismology of two Kepler detached eclipsing binaries. (arXiv:2008.00740v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Liakos_A/0/1/0/all/0/1">Alexios Liakos</a>
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 delta 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 velocities
curves were used to model the light curves of the systems and, therefore, to
calculate the absolute parameters of their components with higher certainty.
The photometric data were analysed using standard eclipsing binary modeling
techniques, while their residuals were further analysed using Fourier
transformation techniques in order to extract the pulsation frequencies of
their host delta Scuti stars. The oscillation modes of the independent
frequencies were identified using theoretical models of delta Scuti stars. The
distances of the systems were calculated using the relation between the
luminosity and the pulsation period for delta Scuti stars. 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 delta Scuti stars in detached binaries, updated
correlations between orbital and dominant pulsation periods and between log g
and pulsation periods were derived. It was found that the proximity of the
companion plays significant role to the evolution of the pulsational
frequencies.
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 delta 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 velocities
curves were used to model the light curves of the systems and, therefore, to
calculate the absolute parameters of their components with higher certainty.
The photometric data were analysed using standard eclipsing binary modeling
techniques, while their residuals were further analysed using Fourier
transformation techniques in order to extract the pulsation frequencies of
their host delta Scuti stars. The oscillation modes of the independent
frequencies were identified using theoretical models of delta Scuti stars. The
distances of the systems were calculated using the relation between the
luminosity and the pulsation period for delta Scuti stars. 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 delta Scuti stars in detached binaries, updated
correlations between orbital and dominant pulsation periods and between log g
and pulsation periods were derived. It was found that the proximity of the
companion plays significant role to the evolution of the pulsational
frequencies.
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