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Quadratic Frequency Dispersion in the Oscillations of Intermediate-mass Stars

  • Authors: Subrata Kumar Panda, Shravan Hanasoge, Siddharth Dhanpal, Vageesh D. C.

Subrata Kumar Panda et al 2024 The Astrophysical Journal Letters 975 .

  • Provider: AAS Journals

Caption: Figure 1.

Quadratic oscillation patterns observed in TESS spectra of δ Scutis. (a) Oscillation spectra of TIC 305274761, which pulsates in only five modes. The spacing between adjacent modes keeps increasing, and the frequencies are well described as a quadratic function of mode labels. Coefficients of a quadratic fit to these frequencies are denoted by (α, β, γ). (b) A stretched échelle diagram where those five modes (square symbols) form a ridge-like structure. (c) Pulsation profile of TIC 422043310, which oscillates over a wide frequency range between 10 and 90 day−1. This star has been reported as a binary system, which is why it shows two distinct groups based on amplitudes. The quadratic spacing feature is seen in the high-amplitude group, suggesting that it is coming from the primary star. (d) Stretched échelle diagram of TIC 422043310. (e) Multiple series of quadratic patterns seen in the power spectrum of TIC 138345546. (f) Various ridges in the stretched échelle diagram, corresponding to the different series of quadratic patterns in the power spectrum of this star.

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