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Asteroseismology of the mild Am δ Sct star HD 118660: TESS photometry and modelling

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dc.contributor.author Sarkar, M
dc.contributor.author Joshi, S
dc.contributor.author Dupret, M. A
dc.contributor.author Trust, Otto
dc.contributor.author De Cat, P
dc.contributor.author Semenko, E
dc.contributor.author Lampens, P
dc.contributor.author Goswami, A
dc.contributor.author Mkrtichian, David
dc.contributor.author Karinkuzhi, D
dc.contributor.author Yakunin, I
dc.contributor.author Gupta, Archana
dc.date.accessioned 2024-11-29T05:24:02Z
dc.date.available 2024-11-29T05:24:02Z
dc.date.issued 2024-11
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 534, No. 4, pp. 3211-3220 en_US
dc.identifier.issn 0035-8711
dc.identifier.uri http://hdl.handle.net/2248/8588
dc.description Open Access en_US
dc.description This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited
dc.description.abstract We present the results of an asteroseismic study of HD 118660 (TIC 171729860), being a chemically peculiar (mild Am) star exhibiting δ Scuti (δ Sct) 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 ( = 0) and five dipolar ( = 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 δ Sct 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 δ Sct 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. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of Royal Astronomical Society en_US
dc.relation.uri https://doi.org/10.1093/mnras/stae2258
dc.rights © 2024 The Author(s)
dc.subject Asteroseismology en_US
dc.subject Convection en_US
dc.subject Diffusion en_US
dc.subject Stars: activity en_US
dc.subject Stars: chemically peculiar en_US
dc.subject Stars: evolution en_US
dc.title Asteroseismology of the mild Am δ Sct star HD 118660: TESS photometry and modelling en_US
dc.type Article en_US


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