Short-term radio variability in the gamma-ray emitting x-ray binary LS I +61°303

The high-mass X-ray binary LS I +61°303 is detected from radio up to very high energy γ-rays. The source consists of a Be star and a compact object in an eccentric orbit. Observations have shown evidence for radio microflares superimposed on larger outbursts. We observed the decaying phase of one large radio outburst with the 100-m telescope in Effelsberg at 5, 8, and 10 GHz. We observed microflaring activity with periodicities of 9.5 and 14.9 hours. We discuss the possible physical processes behind these quasi-periodic oscillations.