Bulletin of the AAS (BAAS), volume 40, number 1, 2008 (10.12)
The high mass X-ray binary LS I +61 303 has been observed over several months in 2006 and 2007 with the VERITAS array of imaging air-Cherenkov telescopes. A signal of high energy gamma rays with energies above 300 GeV is detected in several orbital cycles of the binary system. The detected flux of gamma rays is strongly variable over the orbital period of 26.5 days, while the maximum flux (corresponding to about 10% of the flux of the Crab Nebula) is always found at approximately apastron. This suggests a strong dependence of particle acceleration and propagation on the relative position of the two objects in the system. In this talk, results from these recent VERITAS observations are discussed in the context of contemporaneous X-ray observations.
