Absolute parameters of AE For -- a highly active detached binary of late   K type
  We present photometric and spectroscopic analysis of AE For -- a detached eclipsing binary composed of two late K dwarfs. The masses of the components are found to be 0.6314 +- 0.0035 and 0.6197 +- 0.0034 Msun and the radii to be 0.67 +- 0.03 and 0.63$ +- 0.03 Rsun for primary and secondary component, respectively. Both components are significantly oversized compared to theoretical models, which we attribute to their high activity. They show Halpha, Hbeta, Hgamma, Ca H and Ca K lines in emission, and are heavily spotted, causing large variations of the light curve. 
M. Rozyczka, P. Pietrukowicz, J. Kaluzny, W. Pych, R. Angeloni and I.   Dekany
astro-ph.SR astro-ph.GA