Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertainties
Autor(a) principal: | |
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Data de Publicação: | 1996 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://hdl.handle.net/10216/64731 |
Resumo: | Some alternatives to the traditional mixing-length theory (MLT) have recently been proposed for modelling convective heat transport inside stars. The ideal formulation is one that does not involve any free parameters. However, in our present state of ignorance we still need at least one free parameter in order to build solar models with the correct radius. Having adjusted this parameter (e.g. the mixing-length parameter alpha(c)) to obtain the observed radius, we cannot discriminate non-seismically between different convective theories, regardless of how low-efficiency convection is treated. In this paper we consider how the additional information provided by global p-mode frequencies can be used to investigate low-efficiency convection at the top of the solar convective envelope and discriminate between different theories. We consider a parametrization which in addition to the mixing length has two further parameters: one (beta(c)) which regulates the relative degree of overadiabaticity (or inefficiency) of convection, and a second (m) that affects the transition between the regimes of efficient and inefficient convection. Our parametrization includes traditional MLT and the theory of Canuto & Mazzitelli as particular cases. We study the effect of varying these parameters by constructing a series of envelope models with the same depth of the convection zone and computing their oscillation frequencies. We discuss our results in terms of kernels relating frequency changes to changes in the structure of the superadiabatic region. |
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Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertaintiesCiências Físicas, Astrofísica, Astronomia, FísicaPhysical sciences, Astrophysics, Astronomy, Physical sciencesSome alternatives to the traditional mixing-length theory (MLT) have recently been proposed for modelling convective heat transport inside stars. The ideal formulation is one that does not involve any free parameters. However, in our present state of ignorance we still need at least one free parameter in order to build solar models with the correct radius. Having adjusted this parameter (e.g. the mixing-length parameter alpha(c)) to obtain the observed radius, we cannot discriminate non-seismically between different convective theories, regardless of how low-efficiency convection is treated. In this paper we consider how the additional information provided by global p-mode frequencies can be used to investigate low-efficiency convection at the top of the solar convective envelope and discriminate between different theories. We consider a parametrization which in addition to the mixing length has two further parameters: one (beta(c)) which regulates the relative degree of overadiabaticity (or inefficiency) of convection, and a second (m) that affects the transition between the regimes of efficient and inefficient convection. Our parametrization includes traditional MLT and the theory of Canuto & Mazzitelli as particular cases. We study the effect of varying these parameters by constructing a series of envelope models with the same depth of the convection zone and computing their oscillation frequencies. We discuss our results in terms of kernels relating frequency changes to changes in the structure of the superadiabatic region.19961996-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/10216/64731eng0004-6361Monteiro, MJPFGChristensenDalsgaard, JThompson, MJinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-29T15:45:07Zoai:repositorio-aberto.up.pt:10216/64731Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:31:11.609556Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertainties |
title |
Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertainties |
spellingShingle |
Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertainties Monteiro, MJPFG Ciências Físicas, Astrofísica, Astronomia, Física Physical sciences, Astrophysics, Astronomy, Physical sciences |
title_short |
Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertainties |
title_full |
Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertainties |
title_fullStr |
Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertainties |
title_full_unstemmed |
Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertainties |
title_sort |
Seismic properties of the Sun's superadiabatic layer .1. Theoretical modelling and parametrization of the uncertainties |
author |
Monteiro, MJPFG |
author_facet |
Monteiro, MJPFG ChristensenDalsgaard, J Thompson, MJ |
author_role |
author |
author2 |
ChristensenDalsgaard, J Thompson, MJ |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Monteiro, MJPFG ChristensenDalsgaard, J Thompson, MJ |
dc.subject.por.fl_str_mv |
Ciências Físicas, Astrofísica, Astronomia, Física Physical sciences, Astrophysics, Astronomy, Physical sciences |
topic |
Ciências Físicas, Astrofísica, Astronomia, Física Physical sciences, Astrophysics, Astronomy, Physical sciences |
description |
Some alternatives to the traditional mixing-length theory (MLT) have recently been proposed for modelling convective heat transport inside stars. The ideal formulation is one that does not involve any free parameters. However, in our present state of ignorance we still need at least one free parameter in order to build solar models with the correct radius. Having adjusted this parameter (e.g. the mixing-length parameter alpha(c)) to obtain the observed radius, we cannot discriminate non-seismically between different convective theories, regardless of how low-efficiency convection is treated. In this paper we consider how the additional information provided by global p-mode frequencies can be used to investigate low-efficiency convection at the top of the solar convective envelope and discriminate between different theories. We consider a parametrization which in addition to the mixing length has two further parameters: one (beta(c)) which regulates the relative degree of overadiabaticity (or inefficiency) of convection, and a second (m) that affects the transition between the regimes of efficient and inefficient convection. Our parametrization includes traditional MLT and the theory of Canuto & Mazzitelli as particular cases. We study the effect of varying these parameters by constructing a series of envelope models with the same depth of the convection zone and computing their oscillation frequencies. We discuss our results in terms of kernels relating frequency changes to changes in the structure of the superadiabatic region. |
publishDate |
1996 |
dc.date.none.fl_str_mv |
1996 1996-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://hdl.handle.net/10216/64731 |
url |
https://hdl.handle.net/10216/64731 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0004-6361 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799136221636591616 |