Abstract
We present photometric and spectroscopic analysis of the eclipsing binary IO Aqr with orbital period 2. d 37. The system is detached, with similar almost spherical components. The star is classified as G0 spectral type. In the analysis we have used spectra obtained at a 2-m telescope with a Coude spectrograph for two regions NaD and Hα ,a s well as ASASI band photometry and R, V photometry obtained at a 0.4 m telescope. The model of the star was obtained using a code based on the Wilson-Devinney method. The radii of the stars for our best fit are R1 = 2.09 ± 0.13 Rand R2 = 2.54 ± 0.06 Rwhile the masses of the components are M1 = 1.53 ± 0.02 Mand M2 = 1.64 ± 0.02 M� . Both components are slightly evolved main sequence stars.
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