An interferometric view of hot star disks
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Tipo de documento: | Tese |
Idioma: | eng |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da USP |
Texto Completo: | https://doi.org/10.11606/T.14.2016.tde-16122015-201029 |
Resumo: | Optical long baseline interferometry was recently established as a technique capable of resolving stars and their circumstellar environments at the milliarcsecond (mas) resolution level. This high-resolution opens an entire new window to the study of astrophysical systems, providing information inaccessible by other techniques. Astrophysical disks are observed in a wide variety of systems, from galaxies up to planetary rings, commonly sharing similar physical processes. Two particular disk like systems are studied in the thesis: (i) B He-rich stars that exhibits magnetic fields in order of kG and that trap their winds in structures called magnetospheres; and (ii) Be stars, fast rotating stars that create circumstellar viscous disks. This study uses the interferometric technique to investigate both the photosphere proper and the circumstellar environment of these stars. The objective is to combine interferometry with other observational techniques (such as spectroscopy and polarimetry) to perform a complete and well-constrained physical description of these systems. This description is accompanied by radiative transfer models performed by the HDUST code. |
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info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis An interferometric view of hot star disks Uma visão interferométrica de discos de estrelas quentes 2015-10-06Alex Cavalieri CarciofiJon Eric BjorkmanSamer KanaanPierre KervellaRonaldo Savarino LevenhagenArmando Domiciano de Souza JuniorDaniel Moser FaesUniversidade de São PauloAstronomiaUSPBR circumstellar matter estrelas: campo magnético estrelas: individual (Achernar) estrelas: linha de emissão - Be estrelas: parâmetros fundamentais individual (Achernar) material circunstelar stars: emission-line - Be stars: fundamental parameters stars: magnetic field techniques: interferometric técnicas: interferométrica Optical long baseline interferometry was recently established as a technique capable of resolving stars and their circumstellar environments at the milliarcsecond (mas) resolution level. This high-resolution opens an entire new window to the study of astrophysical systems, providing information inaccessible by other techniques. Astrophysical disks are observed in a wide variety of systems, from galaxies up to planetary rings, commonly sharing similar physical processes. Two particular disk like systems are studied in the thesis: (i) B He-rich stars that exhibits magnetic fields in order of kG and that trap their winds in structures called magnetospheres; and (ii) Be stars, fast rotating stars that create circumstellar viscous disks. This study uses the interferometric technique to investigate both the photosphere proper and the circumstellar environment of these stars. The objective is to combine interferometry with other observational techniques (such as spectroscopy and polarimetry) to perform a complete and well-constrained physical description of these systems. This description is accompanied by radiative transfer models performed by the HDUST code. Interferometria óptica de longa linha de base recentemente estabeleceu-se como uma técnica capaz de resolver estrelas e seus ambientes circunstelares no nível de mili segundos de arcos (\\textit). Esta alta resolução abre uma janela inteiramente nova para o estudo de sistemas astrofísicos, fornecendo informações inacessíveis por outras técnicas. Discos astrofísicos são observados numa ampla variedade de sistemas, de galáxias à discos planetários, em geral compartilhando de processos físicos similares. Dois sistemas de discos foram estudados nesta tese: (i) o estrelas B ricas em He e que possuem campos magnéticos da ordem de kG e que confinam seus ventos em estruturas chamadas magnetosferas; e (ii) estrelas Be, estrelas de rotação rápida que criam um disco circumstelar viscoso. Este estudo usa a técnica interferométrica para investigar ambas a própria fotosfera e o ambiente circunstelar destas estrelas. O objetivo é combinar a interferometria com outras técnicas observacionais (tal como espectroscopia e polarimetria) para realizar uma descrição física completa e precisa destes sistemas. Esta descrição é acompanhada por modelos de transferência radiativa executados pelo código HDUST. https://doi.org/10.11606/T.14.2016.tde-16122015-201029info:eu-repo/semantics/openAccessengreponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USP2023-12-21T19:09:34Zoai:teses.usp.br:tde-16122015-201029Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212023-12-22T12:46:38.486019Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false |
dc.title.en.fl_str_mv |
An interferometric view of hot star disks |
dc.title.alternative.pt.fl_str_mv |
Uma visão interferométrica de discos de estrelas quentes |
title |
An interferometric view of hot star disks |
spellingShingle |
An interferometric view of hot star disks Daniel Moser Faes |
title_short |
An interferometric view of hot star disks |
title_full |
An interferometric view of hot star disks |
title_fullStr |
An interferometric view of hot star disks |
title_full_unstemmed |
An interferometric view of hot star disks |
title_sort |
An interferometric view of hot star disks |
author |
Daniel Moser Faes |
author_facet |
Daniel Moser Faes |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Alex Cavalieri Carciofi |
dc.contributor.referee1.fl_str_mv |
Jon Eric Bjorkman |
dc.contributor.referee2.fl_str_mv |
Samer Kanaan |
dc.contributor.referee3.fl_str_mv |
Pierre Kervella |
dc.contributor.referee4.fl_str_mv |
Ronaldo Savarino Levenhagen |
dc.contributor.referee5.fl_str_mv |
Armando Domiciano de Souza Junior |
dc.contributor.author.fl_str_mv |
Daniel Moser Faes |
contributor_str_mv |
Alex Cavalieri Carciofi Jon Eric Bjorkman Samer Kanaan Pierre Kervella Ronaldo Savarino Levenhagen Armando Domiciano de Souza Junior |
description |
Optical long baseline interferometry was recently established as a technique capable of resolving stars and their circumstellar environments at the milliarcsecond (mas) resolution level. This high-resolution opens an entire new window to the study of astrophysical systems, providing information inaccessible by other techniques. Astrophysical disks are observed in a wide variety of systems, from galaxies up to planetary rings, commonly sharing similar physical processes. Two particular disk like systems are studied in the thesis: (i) B He-rich stars that exhibits magnetic fields in order of kG and that trap their winds in structures called magnetospheres; and (ii) Be stars, fast rotating stars that create circumstellar viscous disks. This study uses the interferometric technique to investigate both the photosphere proper and the circumstellar environment of these stars. The objective is to combine interferometry with other observational techniques (such as spectroscopy and polarimetry) to perform a complete and well-constrained physical description of these systems. This description is accompanied by radiative transfer models performed by the HDUST code. |
publishDate |
2015 |
dc.date.issued.fl_str_mv |
2015-10-06 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://doi.org/10.11606/T.14.2016.tde-16122015-201029 |
url |
https://doi.org/10.11606/T.14.2016.tde-16122015-201029 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo |
dc.publisher.program.fl_str_mv |
Astronomia |
dc.publisher.initials.fl_str_mv |
USP |
dc.publisher.country.fl_str_mv |
BR |
publisher.none.fl_str_mv |
Universidade de São Paulo |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da USP instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Biblioteca Digital de Teses e Dissertações da USP |
collection |
Biblioteca Digital de Teses e Dissertações da USP |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br |
_version_ |
1794502795144986624 |