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SUMMARY:Quadrupolar mixed modes with near-degeneracy effects in an early r
 ed giant and their role in constraining stellar parameters
DTSTART:20260623T053000Z
DTEND:20260623T063000Z
DTSTAMP:20260618T121900Z
UID:indico-event-9369@scitalks.tifr.res.in
DESCRIPTION:Speakers: Meenakshi Gaira (DAA\, TIFR)\n\nAsteroseismology is 
 the study of stellar oscillations to probe the internal structure and dyna
 mics of stars. Evolved solar-like stars exhibit mixed modes that result fr
 om the coupling between pressure($p$)  and  gravity($g$) modes. Dipolar 
 mixed modes have proven to be extremely useful for constraining the intern
 al structure and dynamics of evolved stars. In this talk\, I will discuss 
 quadrupolar mixed modes\, which are often modeled as pure pressure modes i
 n asteroseismic analyses\, since the coupling between quadrupolar $p$ and 
 $g$ modes is roughly an order of magnitude weaker than that for dipolar mo
 des. However\, their rotational splittings are substantially affected by n
 ear-degeneracy effects\, which arise when the frequency spacing between su
 ccessive mixed modes is comparable to or smaller than the rotational split
 tings. Correct characterization of rotational multiplets of quadrupolar mi
 xed modes is important for putting constraints on latitudinal differential
  rotation and for investigating angular momentum transport mechanisms in e
 volved solar-like stars.I will present our detailed analysis of a young re
 d giant whose quadrupolar rotational multiplets show substantial asymmetry
  due to near-degeneracy effects. Using asymptotic theory and an implicit a
 pproach to account for near-degeneracy effects\, we performed a global fit
  of the quadrupolar mixed modes to measure their coupling strength and cha
 racterize their rotational splittings. We then carried out grid-based stel
 lar modeling and assessed how incorporating the quadrupolar mixed-mode fre
 quencies as constraints influences the uncertainties in inferred stellar p
 arameters.\n \n\nhttps://scitalks.tifr.res.in/event/9369/
LOCATION:AG-69
URL:https://scitalks.tifr.res.in/event/9369/
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