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We present photometric and spectroscopic analysis of AE For -- a detachedeclipsing binary composed of two late K dwarfs. The masses of the componentsare found to be 0.6314 +- 0.0035 and 0.6197 +- 0.0034 Msun and the radii to be0.67 +- 0.03 and 0.63$ +- 0.03 Rsun for primary and secondary component,respectively. Both components are significantly oversized compared totheoretical models, which we attribute to their high activity. They showHalpha, Hbeta, Hgamma, Ca H and Ca K lines in emission, and are heavilyspotted, causing large variations of the light curve.

Absolute parameters of AE For -- a highly active detached binary of late K type