Solar-like stars with an external convective envelope can develop magnetic activity cycles under the interaction of convection , rotation and magnetic fields .
Even in the Sun , these dynamo effects are not yet well understood and it would be extremely important to extend this study to different stars with different characteristics .
HD49933 is a F5V , 1.2 solar mass star that has been observed by CoRoT for 60 days during the initial Run and 137 more days about 6 months later .
Thus , a total of 400 days have been covered with the two observations .
Assuming that the activity cycle is proportional to the rotation of the star ( which spins 8-9 times faster than the Sun , i.e. , P _ { rot } =3.4 days ) , CoRoT observations could be good to perform such study .
The analysis techniques employed here hve already been successfully tested on sun-as-a-star observations done by VIRGO and GOLF on board SoHO and ground-based MARK-I instrument .