Context . We present the first high-cadence multiwavelength radial-velocity observations of the Sun-as-a-star, carried out during 57 consecutive days using the stellar échelle spectrograph at the Hertzsprung SONG Telescope operating at the Teide Observatory. Aims . Our aim was to produce a high-quality data set and reference values for the global helioseismic parameters ν max, ⊙ and Δ ν ⊙ of the solar p -modes using the SONG instrument. The obtained data set or the inferred values should then be used when the scaling relations are applied to other stars showing solar-like oscillations observed with SONG or similar instruments. Methods . We used different approaches to analyse the power spectrum of the time series to determine ν max, ⊙ : simple Gaussian fitting and heavy smoothing of the power spectrum. We determined Δ ν ⊙ using the method of autocorrelation of the power spectrum. The amplitude per radial mode was determined using the method described in Kjeldsen et al. (2008, ApJ, 682, 1370). Results . We found the following values for the solar oscillations using the SONG spectrograph: ν max, ⊙ = 3141 ± 12 μ Hz, Δ ν ⊙ = 134.98 ± 0.04 μ Hz, and an average amplitude of the strongest radial modes of 16.6 ± 0.4 cm s −1 . These values are consistent with previous measurements with other techniques.

We report the discovery of an EL CVn-type binary consisting of a low-mass, pre-helium white dwarf and the first detection of hybrid δ Sct-γ Dor pulsations in such binary systems. Based on the four years Kepler data, we determined comprehensive photometric solution of the eclipsing binary KIC 8113154. The light-curve modeling reveals that it is a detached system containing a thermally bloated, low-mass, pre-He white dwarf with the mass of 0.26 ± 0.02 M⊙ and the radius of 0.13 ± 0.01 R⊙. After removal of the binary model from the observed Kepler data, multiple frequency analysis is applied to the light residuals. The Fourier spectrum shows low-order p-modes and high-order g-mode pulsations that very likely stem from the F-type primary component star, which could be classified as a new δ Sct-γ Dor hybrid. We detected 111 frequencies with signal-to-noise amplitude ratios larger than 4.0. From these frequencies, we identified 17 high-order quadrupole (l = 2) g modes, including eight zonal (m = 0) and nine prograde (m = 2) ones, on the basis of which we derived the asymptotic period spacing of the g modes and the internal rotation rate of the convective core. This is significantly smaller than the orbital frequency, indicating that the core and envelope of the primary star in KIC 8113154 rotate differentially.