The most resonant pulsation frequency of δ Scuti stars

Pulsation of the Sun with a period of P 0 ≈ 160 min discovered about two decades ago, is still waiting explanation. In view of the hypothesis about its cosmological origin, and attempting to find signature of this P 0 periodicity among other (short‐period variable) stars, the pulsation frequencies of δ Sct stars are subjected to specific analysis. With a confidence level ≈ 3.8σ it is found that the frequency v 0 = P 0 −1 ≈ 104 m̈Hz, within the error limits, appears indeed to be the most “resonant” one for the total sample of 318 pulsating stars of δ Sct type (the most commensurable, or “synchronizing”, period for all these stars occurs to be 162 ± 4 min). We conjecture that a) the P 0 oscillation might be connected with periodic fluctuations of gravity field (metrics), and b) the primary excitation mechanism of pulsations of δ Sct stars, reffected by this “ubiquitous” P 0 resonance, must be attributed perhaps to superfast rotation of their inner cores (their rates tend to be in near‐resonance with the “universal” v 0 frequency). The arguments are given favouring a cosmoogical nature of the P 0 oscillation.