Detection of solar-like oscillations in the G5 subgiant μ Her

A clear detection of excess of power, providing a substantial evidence for solar-like oscillations in the G5 subgiant mu Her, is presented. This star was observed over seven nights with the SARG echelle spectrograph operating with the 3.6m Italian TNG Telescope, using an iodine absorption cell as a velocity reference. A clear excess of power centered at 1.2 mHz, with peak amplitudes of about 0.9 ms(-1) in the amplitude spectrum is present. Fitting the asymptotic relation to the power spectrum, a mode identification for the l = 0, 1, 2, 3 modes in the frequency range 900 - 1600 mu Hz is derived. The most likely value for the large separation turns out to be 56.5 mu Hz, consistent with theoretical expectations. The mean amplitude per mode (l = 0, 1) at peak power results to be 0.63 ms(-1), almost 3 times larger than the solar one.