2008/01/29 by A. Bonanno, S. Benatti, R. Claudi +5 · 3 citations
Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #Amplitude #Astronomy #Astrophysics #Frequency spectrum #Geophysics and Gravity Measurements #Mathematics #Mode (computer interface) #Optics #Physics #Solar and Space Plasma Dynamics #Spectral density #Spectral line #Spectrograph #Stars #Statistics #Stellar, planetary, and galactic studies #Subgiant #astro-ph
paper · pdf · doi:10.1086/528946
8 pages, 6 figures, ApJ to appear
arxiv created 2008/01/29 · openalex publication_date 2008/04/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A clear detection of excess of power, providing a substantial evidence for solar-like oscillations in the G5 subgiant μ Her, is presented. This star was observed over seven nights with the SARG echelle spectrograph operating with the 3.6 m 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 m s −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 μHz is derived. The most likely value for the large separation turns out to be 56.5 μHz, 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.