Galactic transients with AGILE the case of Eta Carinae and Cygnus X-1

During its first 2.5 years of operation, the gamma-ray AGILE satellite accumulated an extensive dataset for the Galactic plane and carried out a specific search for emission from binary systems. Powerful colliding winds or relativistic jets in these systems can cause strong shocks in which both electrons and protons can be efficiently accelerated producing non-thermal emission. We developed specific tools of analysis for the search of transient gamma-ray sources in the data and several candidates were detected. Their variability and possible association were studied. In this talk we will mainly focus on the results of extensive observations of the Carina Re-gion and the Cygnus Region during the time period 2007 July -mid 2010. Both regions are extremely complex, hosting massive star formation, giant molecular clouds, HII regions and massive star star clusters. We present a detailed analysis of the gamma-ray data for the regions. In particular, we detect a gamma ray source (1AGL J1043-5931) consistent with the position of the colliding wind binary system Eta Carinae, and report a remarkable 2-days gamma-ray flaring episode from this source, providing the long sought first detection above 100 MeV of a colliding wind binary. Several steady and transient sources have been detected by AGILE in the Cygnus Region. Here we present the results of an extensive search for transient gamma-ray emission from the black hole binary system Cygnus X-1, during the period 2007 July -2009 October. We report an episode of significant transient gamma-ray emission detected on 2009, October 16 in a position compatible with Cygnus X-1.