[en] 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 (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 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sarkar, Mrinmoy ; Aryabhatta Research Institute of Observational Sciences, Nainital, India ; Department of Applied Physics, M.J.P. Rohilkhand University, Bareilly, India
Joshi, Santosh; Aryabhatta Research Institute of Observational Sciences, Nainital, India
Dupret, Marc-Antoine ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Trust, Otto ; Department of Physics, Mbarara University of Science and Technology, Mbarara, Uganda
De Cat, Peter ; Royal Observatory of Belgium, Brussels, Belgium
Semenko, Eugene ; National Astronomical Research Institute of Thailand, Mae Rim, Thailand
Lampens, Patricia; Royal Observatory of Belgium, Brussels, Belgium
Goswami, Aruna; Indian Institute of Astrophysics, Bangalore, India
Mkrtichian, David ; National Astronomical Research Institute of Thailand, Mae Rim, Thailand
Karinkuzhi, Drisya; Department of Physics, University of Calicut, Thenhipalam, India
Yakunin, Ilya; Special Astrophysical Observatory, Russian Academy of Sciences, Arkhyz, Russian Federation
Gupta, Archana; Department of Applied Physics, M.J.P. Rohilkhand University, Bareilly, India
Language :
English
Title :
Asteroseismology of the mild Am δ Sct star HD 118660: TESS photometry and modelling
BELSPO - Belgian Federal Science Policy Office CSIR - Council of Scientific and Industrial Research
Funding text :
The authors are thankful to the anonymous reviewer for providing insightful comments that significantly improved the manuscript substantially. For this work, MS acknowledges Dr. Simon J. Murphy for helping with the ideas. The work presented here is supported by the Belgo-Indian Network for Astronomy and Astrophysics (BINA), sanctioned by the Department of Science and Technology (DST, Government of India; DST/INT/Belg/P-09/2017) and the Belgian Federal Science Policy Office (BELSPO, Government of Belgium; BL/33/IN12). MS thanks CSIR for supporting the fellowship (09/948(0006)/2020-EMR-1). SJ and OT acknowledge the financial support received from the BRICS grant DST/ICD/BRICS/Call-5/SAPTARISI/2023(G). IY is grateful to the Russian Science Foundation (RSCF grant 21-12-00147) for the partial financial support. AG, DM, and SJ are grateful for the support received from the Indo-Thailand Programme of Co-operation in Science and Technology through the Indo-Thai joint project DST/INT/Thai/P-16/2019. OT acknowledges the International Science Programme (ISP) of Uppsala University for finanacial support. The PYTHON modules were used in our analysis are LIGHTKURVE, ASTROPY, MATPLOTLIB, SCIPY, and NUMPY.
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