EK Dra ( HD 129333 ) is a young , active , nearby star that is orbited by a low mass companion .
By combining new speckle observations with old and new radial velocity measurements we find that the orbit is highly eccentric with e = 0.82 \pm 0.03 , and we derive the true masses of both components .
The masses are 0.9 \pm 0.1 { M } _ { \odot } and 0.5 \pm 0.1 { M } _ { \odot } , for the primary and secondary , respectively .
From high resolution spectra we derive a new T _ { eff } of 5700 \pm 70 K and a \log g of 4.37 \pm 0.10 , which is different to previous estimates .
However , the new spectroscopic distance differs by only 5.8 % to the distance derived by parallax measurement by the Hipparcos satellite and thus the stellar parameters are presumably more realistic than older determinations .
We derive a somewhat higher value for the metallicity of [ Fe / H ] = -0.16 \pm 0.07 . EK Dra turns out to be one of the few nearby young stars that will evolve similarly to the Sun .
The precise radial velocity measurements taken in the course of this program also allow us to shed more light on the activity of this star .
In 2001 and 2002 we find radial velocity variation with a period of 2.767 \pm 0.005 days which we interpret as the rotation period .
This signal vanishes in 2003 .
However the signal can be recovered if only the spectra in which the photospheric lines are asymmetric are used .
On the other hand , we do not find a close correlation between the asymmetry of photospheric lines and the radial velocity .