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The analysis of the high-precision photometric K2 data reveals that the light variations in HD\u200973045 and HD\u200976310 are rotational in nature and caused by spots or cloud-like co-rotating structures, which are non-stationary and short-lived. The time-resolved radial velocity measurements, in combination with the K2 photometry, confirm that HD\u200973045 does not show any periodic variability on time-scales shorter than 1.3\u2009d, contrary to previous reports in the literature. In addition to these new rotational variables, we discovered a new heartbeat system, HD\u200973619, where no pulsational signatures are seen. The spectroscopic and spectropolarimetric analyses indicate that HD\u200973619 belongs to the peculiar Am class, with either a weak or no magnetic field, considering the 200-G detection limit of our study. The least-squares deconvolution profiles for HD\u200976310 indicate a complex structure in its spectra, suggesting that this star is either part of a binary system or surrounded by a cloud shell. When placed in the Hertzsprung\u2013Russell diagram, all studied stars are evolved from the main sequence and situated in the \u03b4\u2009Scuti instability strip. This work is relevant for further detailed studies of chemically peculiar stars, for example on inhomogeneities (including spots) in the absence of magnetic fields and the origin of the pulsational variability in heartbeat systems.<\/jats:p>","DOI":"10.1093\/mnras\/stab3158","type":"journal-article","created":{"date-parts":[[2021,10,28]],"date-time":"2021-10-28T19:13:25Z","timestamp":1635448405000},"page":"5854-5871","source":"Crossref","is-referenced-by-count":9,"title":["Study of chemically peculiar stars\u00a0\u2013\u00a0I. 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