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Inferences from the Pulsations of δ Scuti Stars Observed by TESS
Talk title: Inferences of the internal structure and dynamics of δ
Scuti Stars from TESS observations of their pulsations
Abstract:
Stars of intermediate mass, commonly referred to as δ Scutis, spin
rapidly and deform into ellipsoids. Our understanding of the
astrophysical processes occurring in these stars is limited. We
attempted to retrieve the information preserved in their complex
acoustic vibrations. Utilizing the high quality TESS observation, we
compiled a new catalogue of 6711 δ Scuti stars. For some of these
stars, we were able to infer fundamental properties including mass,
metallicity, ages, and rotation rates. This offered valuable insights
into their spin-down mechanisms and internal magnetic fields. A
detailed analysis of their frequency splittings allowed us to measure
external distortion, and variation profile of internal rotation.
Additionally, in the pulsation of 80 other stars, We also detected a
novel quadratic frequency dispersion, potentially connected to stellar
rotation.