In this study we present photometric and spectroscopic variation analysis and orbital period study of a low-mass interacting system OO Aql. Simultaneous solution of the light and radial velocity curves provide us a determination of new set of stellar physical parameters for the primary and the secondary companion as M$_{ 1}$ = 1.05(2) M$_{ \odot}$, M$_{ 2}$ = 0.89(2) M$_{ \odot}$, R$_{ 1}$ = 1.38(2) R$_{ \odot}$, R$_{ 2}$ = 1.28(2) R$_{ \odot}$, $\log{ (L_1/L_{ \odot})} = 0.258$ and $\log{ (L_2/L_{ \odot})} = 0.117$ and the separation of the components were determined a = 3.333(16) R$_{ \odot}$. Newly obtained parameters yield the distance of the system as 136(8) pc. Analyses of the mid-eclipse times indicate a period increase of $\frac{ P}{ \dot{ P}}=4\times 10^{ 7}$ yr that can be interpreted in terms of the mass transfer $\frac{ dM}{ dt}=5\times 10^{ -8}$ M$_{ \odot}$/yr from the less massive component to the more massive component. Our new solution confirmed that OO Aql is a multiple system in the form of AB + C + D. We found initial astrophysical parameters for the component of the system and its current age to be 8.6 Gyr using nonconservative stellar evolution model (EV-TWIN code).
Categories: astro-ph.SR