000005505 001__ 5505
000005505 005__ 20220201143219.0
000005505 0247_ $$2DOI$$a10.1093/mnras/stab3158
000005505 037__ $$aSCART-2021-0157
000005505 100__ $$aJoshi, S.
000005505 245__ $$aStudy of Chemically Peculiar Stars-I : High-resolution Spectroscopy and K2 Photometry of Am Stars in the Region of M44
000005505 260__ $$c2022
000005505 520__ $$aWe present a study based on the high-resolution spectroscopy and K2 space photometry of five chemically peculiar stars in the region of the open cluster M44. The analysis of the high-precision photometric K2 data reveals that the light variations in HD 73045 and HD 76310 are rotational in nature and caused by spots or cloud-like co-rotating structures, which are non-stationary and short-lived. The time-resolved radial velocity measurements, in combination with the K2 photometry, confirm that HD 73045 does not show any periodic variability on timescales shorter than 1.3 d, contrary to previous reports in the literature. In addition to these new rotational variables, we discovered a new heartbeat system, HD 73619, where no pulsational signatures are seen. The spectroscopic and spectropolarimetric analyses indicate that HD 73619 belongs to the peculiar Am class, with either a weak or no magnetic field considering the 200 G detection limit of our study. The Least-Squares Deconvolution (LSD) profiles for HD 76310 indicate a complex structure in its spectra suggesting that this star is either part of a binary system or surrounded by a cloud shell. When placed in the Hertzsprung-Russell diagram, all studied stars are evolved from main-sequence and situated in the δ Scuti instability strip. The present work is relevant for further detailed studies of CP stars, such as inhomogeneities (including spots) in the absence of magnetic fields and the origin of the pulsational variability in heartbeat systems.
000005505 594__ $$aNO
000005505 6531_ $$aStars: chemically peculiar
000005505 6531_ $$astars: individual (HD 73045, HD 73574, HD 73618, HD 73619, HD 76310)
000005505 6531_ $$astars: rotation, techniques
000005505 6531_ $$aphotometry
000005505 6531_ $$aspectroscopy
000005505 6531_ $$aspectropolarimetry
000005505 700__ $$aTrust, O.
000005505 700__ $$aSemenko, E.
000005505 700__ $$aWilliams, P.E.
000005505 700__ $$aLampens, P.
000005505 700__ $$aDe Cat, P.
000005505 700__ $$aVermeylen, L.
000005505 700__ $$aHoldsworth, D.L.
000005505 700__ $$aGarcía, R.A.
000005505 700__ $$aMathur, S.
000005505 700__ $$aSantos, A.R.G.
000005505 700__ $$aMkrtichian, D.
000005505 700__ $$aGoswami, A.
000005505 700__ $$aCuntz, M.
000005505 700__ $$aYadav, A.P.
000005505 700__ $$aSarkar, M.
000005505 700__ $$aBhatt, B.C.
000005505 700__ $$aKahraman Aliçavuş, F.
000005505 700__ $$aNhlapo, M.D.
000005505 700__ $$aLund, M.N.
000005505 700__ $$aGoswami, P.P.
000005505 700__ $$aSavanov, I.
000005505 700__ $$aJorissen, A.
000005505 700__ $$aJurua, E.
000005505 700__ $$aAvvakumova, E.
000005505 700__ $$aDmitrienko, E.S.
000005505 700__ $$aChakradhari, N.K.
000005505 700__ $$aDas, M.K.
000005505 700__ $$aChowdhury, S.
000005505 700__ $$aAbedigamba, O.P.
000005505 700__ $$aYakunin, I.
000005505 700__ $$aLetarte, B.
000005505 700__ $$aKarinkuzhi, D.
000005505 773__ $$c5854--5871$$pMonthy Notices of the Royal Astronomical Society$$v510
000005505 8560_ $$fpeter.decat@observatoire.be
000005505 8564_ $$s17400389$$uhttp://publi2-as.oma.be/record/5505/files/JoshiS2021_MNRAS_accepted.pdf
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000005505 905__ $$apublished in
000005505 980__ $$aREFERD