Good Vibrations Seminar #4: Mariel Lares (IAA-CSIC, Granada)

February 24, 2021 | 10:00 am 11:00 am
CET, Granada, Spain

Check out the video of the talk: (slides below)

Check out Mariel’s slides:
https://sites.lesia.obspm.fr/the-good-vibrations-seminars/files/2021/03/MLM_good_vibes.pdf

Non-linear terms in Delta Scuti stars power spectra

Mariel Lares Martiz (Institute of Astrophysics of Andalusia IAA-CSIC, Granada)

Non-linear theory of pulsations could explain special characteristics observed in many variable star light curves, however, non-linear models are far from being complete. Ultra-precise photometric data captures the footprints of non-linear processes happening within a pulsating star, which are translated in their power spectra as combination frequencies (additions and subtraction of the eigenfrequencies). In this talk, I will present a study of combination frequencies in δ Scuti star power spectra, aiming to empirically characterize their non-linear behavior. Based on the study of frequency, amplitude and phase relations given by the Volterra series formulation (a general non-linear model), a self-consistent method to identify combination frequencies with high precision, a possible method to unambiguously identify the non-linear process behind a combination frequency, as well as the possible first use of combination frequencies for mode identification in δ Sct stars are, among others, the most relevant results.

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