000007794 001__ 7794
000007794 005__ 20260109155457.0
000007794 037__ $$aPOSTER-2026-0024
000007794 100__ $$aSarkar, Mrinmoy
000007794 245__ $$aAsteroseismology of the mild Am delta Sct star HD 118660: TESS photometry and modelling
000007794 260__ $$c2025
000007794 269__ $$c2025-02-15
000007794 520__ $$aWe present the results of an asteroseismic study of HD 118660 (TIC 171729860), a chemically peculiar (mild Am) star exhibiting delta scuti pulsations. It is based on the analysis of two sectors of time-series photometry from the space mission TESS ( Transiting Exoplanet Survey Satellite ) and seismic modelling. It yielded the detection of 15 and 16 frequencies for TESS sectors 23 and 50, respectively. The identified pulsation modes include four radial ( l = 0) and five dipolar ( l = 1) ones. The radial modes are overtones with order n ranging from 3 and 6. Such high values of n are theoretically not expected for stars with the effective temperature of HD 118660 ( Teff ≈ 7550 K) located near the red edge of the delta scuti instability strip. To estimate the asteroseismic parameters, we have generated a grid of stellar models assuming a solar metallicity ( Z = 0.014) and different values for the convective overshooting parameter (0.1 ≤ αov ≤ 0.3). We conclude that the analysis of the radial modes is insufficient to constrain αov and Z for delta scuti stars. The value for the equatorial velocity of HD 118660 derived from the seismic radius and the rotational frequency is consistent with values found in the literature.
000007794 594__ $$aNO
000007794 700__ $$aJoshi, Santosh
000007794 700__ $$aDupret, Marc-Antoine
000007794 700__ $$aTrust, Otto
000007794 700__ $$aDe Cat, Peter
000007794 700__ $$aSemenko, Eugene
000007794 700__ $$aLampens, Patricia
000007794 700__ $$aGoswami, Aruna
000007794 700__ $$aMkrtichian, David
000007794 700__ $$aKarinkuzhi, Drisya
000007794 700__ $$aYakunin, Ilya
000007794 700__ $$aGupta, Archana
000007794 773__ $$t43rd meeting of the Astronomical Society of India (ASI2025), Rourkela, India
000007794 8560_ $$fpeter.decat@ksb-orb.be
000007794 8564_ $$s1260133$$uhttps://publi2-as.oma.be/record/7794/files/Sarkar2025_AsiSonfP_5.pdf
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000007794 980__ $$aCPOSTER