000007771 001__ 7771
000007771 005__ 20260108161312.0
000007771 0247_ $$2DOI$$a10.1093/mnras/staf1446
000007771 037__ $$aSCART-2026-0041
000007771 100__ $$aJoshi, Santosh
000007771 245__ $$aAsteroseismology of HD 23734, HD 68703, and HD 73345 using K2─TESS space-based photometry and high-resolution spectroscopy
000007771 260__ $$c2025
000007771 520__ $$aIn this paper, we present a comprehensive study of three stars, HD 23734, HD 68703, and HD 73345, which were previously observed as chemically peculiar candidates within the Nainital-Cape survey and reported as null results for the pulsational variability. Frequency analyses of K2 and TESS time-series photometric data reveal the co-existence of rotational modulation and pulsation. We use the spectrum synthesis technique to determine fundamental parameters and chemical composition, which shows that all the three stars are likely to be chemically normal. The evolutionary status of the target stars corresponds to the main-sequence phases and places them within the δ Scuti instability strip of the Hertzsprung─Russell diagram. The line profile variability is observed in all three stars, especially intriguing in HD 68703 and a typical signature of the non-radial pulsation, demands further detailed examination. Using TESS photometry, we identified the radial modes of orders n = 3 and 4 for HD 23734, n = 1, 3, and 4 for HD 68703, and n = 3, 4, and 5 for HD 73345. In addition to the presence of pulsation and rotation, HD 73345 exhibits a steady increase in radial velocity that we interpret as the star being likely to be part of a long-period binary system. Finally, we propose an extended campaign aimed for the in-depth spectroscopic and spectropolarimetric study of selected pulsating stars monitored under the Nainital-Cape survey project.
000007771 594__ $$aNO
000007771 6531_ $$aAsteroseismology
000007771 6531_ $$aStars: chemically peculiar
000007771 6531_ $$aStars: oscillations
000007771 6531_ $$aSolar and Stellar Astrophysics
000007771 700__ $$aDileep, Athul
000007771 700__ $$aSemenko, Eugene
000007771 700__ $$aSarkar, Mrinmoy
000007771 700__ $$aTrust, Otto
000007771 700__ $$aDe Cat, Peter
000007771 700__ $$aLampens, Patricia
000007771 700__ $$aDupret, Marc-Antoine
000007771 700__ $$aGhosh, Surath C.
000007771 700__ $$aMkrtichian, David
000007771 700__ $$aVanrespaille, Mathijs
000007771 700__ $$aParida, Sugyan
000007771 700__ $$aYadav, Abhay Pratap
000007771 700__ $$aKumar S, Pramod
000007771 700__ $$aGoswami, P. P.
000007771 700__ $$aRiyas, Muhammed
000007771 700__ $$aKarinkuzhi, Drisya
000007771 773__ $$c640--661$$n1$$pMonthly Notices of the Royal Astronomical Society$$v543$$y2025
000007771 8560_ $$fpeter.decat@ksb-orb.be
000007771 8564_ $$s7754017$$uhttps://publi2-as.oma.be/record/7771/files/JoshiS2025_MNRAS543_640.pdf
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000007771 905__ $$apublished in
000007771 980__ $$aREFERD