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Study of chemically peculiar stars - I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44

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dc.contributor.author Joshi, Santosh
dc.contributor.author Trust, Otto
dc.contributor.author Semenko, E
dc.contributor.author Williams, P. E
dc.contributor.author Lampens, P
dc.contributor.author De Cat, P
dc.contributor.author Vermeylen, L
dc.contributor.author Holdsworth, D. L
dc.contributor.author García, R. A
dc.contributor.author Mathur, S
dc.contributor.author Santos, A. R. G
dc.contributor.author Mkrtichian, D
dc.contributor.author Goswami, A
dc.contributor.author Cuntz, M
dc.contributor.author Yadav, A. P
dc.contributor.author Sarkar, M
dc.contributor.author Bhatt, B. C
dc.contributor.author Kahraman Alicavus, F
dc.contributor.author Nhlapo, M. D
dc.contributor.author Lund, M. N
dc.contributor.author Goswami, P. P
dc.contributor.author Savanov, I
dc.contributor.author Jorissen, A
dc.contributor.author Jurua, E
dc.contributor.author Avvakumova, E
dc.contributor.author Dmitrienko, E. S
dc.contributor.author Chakradhari, N. K
dc.contributor.author Das, M. K
dc.contributor.author Chowdhury, S
dc.contributor.author Abedigamba, O. P
dc.contributor.author Yakunin, I
dc.contributor.author Letarte, B
dc.contributor.author Karinkuzhi, D
dc.date.accessioned 2022-06-21T08:28:50Z
dc.date.available 2022-06-21T08:28:50Z
dc.date.issued 2022-03
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 510, No. 4, pp. 5854–5871 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://hdl.handle.net/2248/7964
dc.description Restricted Access en_US
dc.description.abstract We 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 time-scales 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 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 the main sequence and situated in the δ Scuti 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. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of Royal Astronomical Society en_US
dc.relation.uri https://doi.org/10.1093/mnras/stab3158
dc.rights © Royal Astronomical Society
dc.subject Techniques: photometric, spectroscopic, polarimetric en_US
dc.subject Stars: chemically peculiar en_US
dc.subject Stars:  activity en_US
dc.subject Stars: binaries en_US
dc.title Study of chemically peculiar stars - I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44 en_US
dc.type Article en_US


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