Spectroscopy of hot ? Doradus and A-F hybrid Kepler candidates close to the hot border of the ? Scuti instability strip

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dc.authoridKahraman Alicavus, Filiz/0000-0002-9036-7476
dc.authoridHandler, Gerald/0000-0001-7756-1568
dc.authoridCatanzaro, Giovanni/0000-0003-4337-8612
dc.contributor.authorAlicavus, F. Kahraman
dc.contributor.authorPoretti, E.
dc.contributor.authorCatanzaro, G.
dc.contributor.authorSmalley, B.
dc.contributor.authorNiemczura, E.
dc.contributor.authorRainer, M.
dc.contributor.authorHandler, G.
dc.date.accessioned2025-01-27T20:14:43Z
dc.date.available2025-01-27T20:14:43Z
dc.date.issued2020
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractIf gamma Dor-type pulsations are driven by the convective blocking mechanism, a convective envelope at a sufficient depth is essential. There are several hot gamma Dor and hybrid star candidates in which there should not be an adequate convective envelope to excite the gamma Dor-type oscillations. The existence of these hot objects needs an explanation. Therefore, we selected, observed, and studied 24 hot gamma Dor and hybrid candidates to investigate their properties. The atmospheric parameters, chemical abundances, and vsin i values of the candidates were obtained using medium-resolution (R = 46 000) spectra taken with the Fibre-fed Echelle Spectrograph instrument mounted at the Nordic Optical Telescope. We also carried out frequency analyses of the Kepler long- and short-cadence data to determine the exact pulsation contents. We found only five bona fide hot gamma Dor and three bona fide hot hybrid stars in our sample. The other 16 stars were found to be normal gamma Dor, delta Sct, or hybrid variables. No chemical peculiarity was detected in the spectra of the bona fide hot gamma Dor and hybrid stars. We investigated the interplay between rotation and pulsational modes. We also found that the hot gamma Dor stars have higher Gaia luminosities and larger radii compared to main-sequence A-F stars.
dc.description.sponsorshipPolish National Center for Science (NCN) [2015/18/A/ST9/00578]; Polish National Science Center [2014/13/B/ST9/00902]; Scientific and Technological Research Council of Turkey (TUBITAK) [2214-A, 2211-C]; Wroclaw Centre for Networking and Supercomputing [214]
dc.description.sponsorshipThe authors thank the anonymous referee for useful comments that have improved the presentation of their results. The authors also thank Simon Murphy for his useful comments on a first draft of the manuscript. This article is based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, under the proposal 54-003 (P.I. E. Poretti). The authors thank the whole NOT staff for the help in the observations, performed in visitor mode. FKA and GH thank the Polish National Center for Science (NCN) for supporting the study through grant 2015/18/A/ST9/00578. EN acknowledges support provided by the Polish National Science Center through grant no. 2014/13/B/ST9/00902. This work has been partly supported by the Scientific and Technological Research Council of Turkey (TUBITAK) grant numbers 2214-A and 2211-C. The calculations have been carried out in Wroclaw Centre for Networking and Supercomputing (http://www.wcss.pl), grantNo. 214. This research hasmade use of the SIMBADdata base, operated atCDS(the Centre de Donn ' ees astronomiques de Strasbourg Strasbourg), France.
dc.identifier.doi10.1093/mnras/staa399
dc.identifier.endpage4532
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.issue3
dc.identifier.scopus2-s2.0-85085387438
dc.identifier.scopusqualityQ1
dc.identifier.startpage4518
dc.identifier.urihttps://doi.org/10.1093/mnras/staa399
dc.identifier.urihttps://hdl.handle.net/20.500.12428/21184
dc.identifier.volume493
dc.identifier.wosWOS:000526035600101
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.subjectstars: abundances
dc.subjectstars: atmospheres
dc.subjectstars: general
dc.subjectstars: oscillations
dc.subjectstars: rotation
dc.titleSpectroscopy of hot ? Doradus and A-F hybrid Kepler candidates close to the hot border of the ? Scuti instability strip
dc.typeArticle

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