Abstract Details
| Name: | Mrinmoy Sarkar |
| Affiliation: | Aryabhatta Research Institute of Observational Sciences |
| Conference ID: | ASI2025_151 |
| Title: | Asteroseismology of the mild Am delta Sct star HD 118660: TESS photometry and modelling |
| Authors: | Mrinmoy Sarkar 1 , 2 Santosh Joshi 1, Marc-Antoine Dupret 3, Otto Trust 4, Peter De Cat 5, Eugene Semenko 6, Patricia Lampens 5, Aruna Goswami 7, David Mkrtichian 6, Drisya Karinkuzhi 8, Ilya Yakunin 9, Archana Gupta 2 |
| Authors Affiliation: | 1 Mrinmoy Sarkar, Santosh Joshi Affilation (Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital263002, India) 2 Mrinmoy Sarkar, Archana Gupta Affilation (Department of Applied Physics, M.J.P. Rohilkhand University, Bareilly, Uttar Pradesh 243006, India) 3 Marc-Antoine Dupret Affilation (Space Sciences, Technologies and Astrophysics Research (STAR) Institute, University of Li ège, B-4000 Sart Tilman, Belgium) 4 Otto Trust Affilation (Department of Physics, Mbarara University of Science and Technology, P.O. Box 1410, Mbar ar a, Uganda) 5 Peter De Cat Affilation (Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium) 6 Eugene Semenko, David Mkrtichian Affilation (David National Astronomical Research Institute of Thailand Mae Rim, Chiang Mai-50180, Thailand) 7 Aruna Goswami Affilation (Indian Institute of Astrophysics, Koramangala, Bangalore560034, India) 8 Drisya Karinkuzhi Affiliation (Department of Physics, University of Calicut, Thenhipalam, Malappuram 673635, India) 9 Ilya Yakunin Affilation (Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz369167, Russia) |
| Mode of Presentation: | Poster |
| Abstract Category: | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract: | We 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. |