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.authoridGarcia, Rafael A./0000-0002-8854-3776
dc.authoridMathur, Savita/0000-0002-0129-0316
dc.authoridSemenko, Eugene/0000-0002-1912-1342
dc.authoridNhlapo, Dan/0009-0008-7276-7290
dc.authoridTrust, Otto/0000-0001-5209-7041
dc.authoridLund, Mikkel Norup/0000-0001-9214-5642
dc.authoridDe Cat, Peter/0000-0001-5419-2042
dc.contributor.authorJoshi, Santosh
dc.contributor.authorTrust, Otto
dc.contributor.authorSemenko, E.
dc.contributor.authorWilliams, P. E.
dc.contributor.authorLampens, P.
dc.contributor.authorDe Cat, P.
dc.contributor.authorVermeylen, L.
dc.date.accessioned2025-01-27T20:43:47Z
dc.date.available2025-01-27T20:43:47Z
dc.date.issued2022
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractWe 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 delta 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.
dc.description.sponsorshipBelgo-Indian Network for Astronomy and Astrophysics (BINA) [DST/INT/Belg/P-09/2017]; Belgian Federal Science Policy Office (BELSPO, Government of Belgium) [BL/33/IN12]; International Science Programme (ISP) of Uppsala University; African Astronomical Society (AfAS); Science and Technology Facilities Council (STFC) [ST/M000877/1]; Indo-Thailand Programme of co-operation in Science and Technology through the Indo-Thai joint project [DST/INT/Thai/P-16/2019]; Polish National Center for Science (NCN) [2015/18/A/ST9/00578]; CNES PLATO grant; Spanish Ministry with the Ramony Cajal fellowship [RYC-2015-17697]; NASA [NNX17AF27G]; STFC [ST/T000252/1]; Government of the Russian Federation; Ministry of Higher Education and Science of the Russian Federation [075-15-2020-780 (N13.1902.21.0039)]; NASA [1002163, NNX17AF27G] Funding Source: Federal RePORTER; STFC [ST/T000252/1, ST/M000877/1] Funding Source: UKRI
dc.description.sponsorshipThe work presented here is supported by the Belgo-Indian Network for Astronomy and Astrophysics (BINA), sanctioned by the Department of Science and Technology (DST, Government of India; DST/INT/Belg/P-09/2017) and the Belgian Federal Science Policy Office (BELSPO, Government of Belgium; BL/33/IN12). OT and EJ thank the International Science Programme (ISP) of Uppsala University and African Astronomical Society (AfAS) for financial support. DLH acknowledges financial support from the Science and Technology Facilities Council (STFC) via grant ST/M000877/1. AG, DM, and SJ are grateful for the support received from the Indo-Thailand Programme of co-operation in Science and Technology through the Indo-Thai joint project DST/INT/Thai/P-16/2019. FKA and SC thank the Polish National Center for Science (NCN) for grant 2015/18/A/ST9/00578. RAG acknowledges support from the CNES PLATO grant. SM acknowledges support from the Spanish Ministry with the Ramony Cajal fellowship number RYC-2015-17697. ARGS acknowledges support from NASA under grant no. NNX17AF27G and from STFC consolidated grant ST/T000252/1. IS thanks the Government of the Russian Federation and the Ministry of Higher Education and Science of the Russian Federation, grant no. 075-15-2020-780 (N13.1902.21.0039). This paper includes data collected by the K2 mission available at Mikulski Archive for Space Telescopes (MAST), SIMBAD and NASA's ADS. The authors thank the anonymous reviewer for the insightful comments and suggestions which led to improvements in the manuscript.
dc.identifier.doi10.1093/mnras/stab3158
dc.identifier.endpage5871
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.issue4
dc.identifier.scopus2-s2.0-85125121841
dc.identifier.scopusqualityQ1
dc.identifier.startpage5854
dc.identifier.urihttps://doi.org/10.1093/mnras/stab3158
dc.identifier.urihttps://hdl.handle.net/20.500.12428/24373
dc.identifier.volume510
dc.identifier.wosWOS:000764893600001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOxford Univ Press
dc.relation.ispartofMonthly Notices of The Royal Astronomical Society
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjecttechniques: photometric
dc.subjectspectroscopic
dc.subjectpolarimetric
dc.subjectstars: chemically peculiar
dc.subjectstars: activity
dc.subjectstars: binaries
dc.titleStudy of chemically peculiar stars - I. High-resolution spectroscopy and K2 photometry of Am stars in the region of M44
dc.typeArticle

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