KIC 10736223: An Algol-type eclipsing binary just undergone the rapid mass-transfer stage

Abstract

This paper reports the discovery of an Algol system KIC 10736223 that just past the rapid mass transfer stage. From the light curve and radial-velocity modelling we find KIC 10736223 to be a detached Algol system with the less-massive secondary nearly filling its Roche lobe. Based on the short-cadence Kepler data, we analyzed intrinsic oscillations of the pulsator and identified six secured independent $\delta$ Scuti-type pulsation modes ($f_1$, $f_3$, $f_9$, $f_{19}$, $f_{42}$, and $f_{48}$). We compute two grids of theoretical models to reproduce the $\delta$ Scuti freqiencies, and find fitting results of mass-accreting models meet well with those of single-star evolutionary models. The fundamental parameters of the primary star yielded with asteroseismology are $M$ = $1.57_{-0.09}^{+0.05}$ $M_{\odot }$, $Z$ = 0.009 $\pm$ 0.001, $R$ = $1.484_{-0.028}^{+0.016}$ $R_{\odot }$, $\log g$ = $4.291_{-0.009}^{+0.004}$, $T_{\mathrm{eff}}$ = $7748_{-378}^{+230}$ K, $L$ = $7.136_{-1.519}^{+1.014}$ $L_{\odot }$. The asteroseismic parameters match well with the dynamical parameters derived from the binary model. Moreover, our asteroseismic results show that the pulsator is an almost unevolved star with an age between 9.46-11.65 Myr for single-star evolutionary models and 2.67-3.14 Myr for mass-accreting models. Thereofore, KIC 10736223 may be an Algol system that has just undergone the rapid mass-transfer process.

19 pages, 7 figures, and 8 tables. Accepted by ApJ

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