1. Repositório Institucional da UFMG
  2. Publicações Científicas e Culturais
  3. Artigo de Periódico
Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/60352
Full metadata record
DC FieldValueLanguage
dc.creatorRafael Ramon Ferreirapt_BR
dc.creatorRafaella Barbosapt_BR
dc.creatorMatthieu Sébastien Castropt_BR
dc.creatorGustavo Andres Guerrero Erasopt_BR
dc.creatorLeandro de Almeidapt_BR
dc.creatorPatrick Boumierpt_BR
dc.creatorJosé Dias do Nascimento Júniorpt_BR
dc.date.accessioned2023-10-31T17:27:43Z-
dc.date.available2023-10-31T17:27:43Z-
dc.date.issued2020-
dc.citation.volume640pt_BR
dc.citation.spage1pt_BR
dc.citation.epage12pt_BR
dc.identifier.doihttps://doi.org/10.1051/0004-6361/201937219pt_BR
dc.identifier.issn1432-0746pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/60352-
dc.description.resumoCONTEXT. One of the most enigmatic phenomena related to solar activity is the so-called Maunder minimum phase. It consists in the lowest sunspot count ever registered for the Sun and has not been confirmed for other stars to date. Since the spectroscopic observations of stellar activity at the Mount Wilson Observatory, the solar analog HD 43587 has shown a very low and apparently invariant activity level, which makes it a Maunder minimum candidate. AIMS. We aim to analyze the chromospheric activity evolution of HD 43587 and its evolutive status, with the intention of unraveling the reasons for this low and flat activity. METHODS. We used an activity measurements dataset available in the literature, and computed the S -index from HARPS and NARVAL spectra to infer a cycle period. Additionally, we analyzed the CoRoT light curve of HD 43587, and applied gyrochronology and activity calibrations to determine its rotation period. Finally, based on an evolutionary model and the inferred rotation period, we used the EULAG-MHD code to perform global MHD simulations of HD 43587 to get some insight into its dynamo process. RESULTS. We confirm the almost flat activity profile, with a cycle period Pcyc = 10.44 ± 3.03 yr deduced from the S -index time series, and a long-term trend that might be a period of more than 50 yr. It was impossible to define a rotation period from the light curve, however gyrochronology and activity calibrations allow us to infer an indirect estimate of Prot = 22.6 ± 1.9 d. Furthermore, the MHD simulations confirm an oscillatory dynamo with a cycle period in good agreement with the observations and a low level of surface magnetic activity. CONCLUSIONS. We conclude that this object might be experiencing a “natural” decrease in magnetic activity as a consequence of its age. Nevertheless, the possibility that HD 43587 is in a Maunder minimum phase cannot be ruled out.pt_BR
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológicopt_BR
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpt_BR
dc.description.sponsorshipFAPESP - Fundação de Amparo à Pesquisa do Estado de São Paulopt_BR
dc.format.mimetypepdfpt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICX - DEPARTAMENTO DE FÍSICApt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofAstronomy & Astrophysics-
dc.rightsAcesso Abertopt_BR
dc.subjectStarspt_BR
dc.subjectRotationpt_BR
dc.subjectMagnetic fieldpt_BR
dc.subject.otherEstrelaspt_BR
dc.subject.otherCampos magnéticospt_BR
dc.titleIs the primary CoRoT target HD 43587 under a Maunder minimum phase?pt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://www.aanda.org/articles/aa/abs/2020/08/aa37219-19/aa37219-19.htmlpt_BR
dc.identifier.orcidhttp://orcid.org/0000-0001-7255-3489pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-1332-2477pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-2671-8796pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-8179-1147pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-7804-2145pt_BR
Appears in Collections:Artigo de Periódico

Files in This Item:
File Description SizeFormat 
Is the primary CoRoT target HD 43587 under a Maunder minimum phase.pdf4.09 MBAdobe PDFView/Open
Show simple item record


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.