Evolutionary track of representative models of the red-giant stars with [M∕H] = −0.37 star in the T_eff- logg plane. The black solid and red dotted lines represent the evolution of a 1.39 M_⊙ star computed assuming a grey atmosphere or a fit to realistic PHOENIX model atmospheres as an outer boundary condition to the stellar structure equations, respectively. The grey dashed line is also computed with PHOENIX atmospheres and assuming a reduced mass of 1.18 M_⊙. The positions of the primary and the secondary components of KIC 9163796 along this evolutionary track from spectroscopic parameters are marked in blue and red, respectively.