DYNAMICAL EVOLUTION OF VISCOUS DISKS AROUND Be STARS. I. PHOTOMETRY

Autor(es)

Haubois, X. ^[1] ; Carciofi, A. C. ^[1] ; Rivinius, Th ^[2] ; Okazaki, A. T. ^[3] ; Bjorkman, J. E. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo - Brazil

^[2] European Org Astron Res So Hemisphere, Santiago 19 - Chile

^[3] Hokkai Gakuen Univ, Fac Engn, Toyohira Ku, Sapporo, Hokkaido 0628605 - Japan

^[4] Univ Toledo, Dept Phys & Astron, Ritter Observ, Toledo, OH 43606 - USA

• Tipo de documento: Artigo Científico
• Fonte: ASTROPHYSICAL JOURNAL; v. 756, n. 2 SEP 10 2012.
• Citações Web of Science: 57

Resumo

Be stars possess gaseous circumstellar disks that modify in many ways the spectrum of the central B star. Furthermore, they exhibit variability at several timescales and for a large number of observables. Putting the pieces together of this dynamical behavior is not an easy task and requires a detailed understanding of the physical processes that control the temporal evolution of the observables. There is an increasing body of evidence that suggests that Be disks are well described by standard alpha-disk theory. This paper is the first of a series that aims at studying the possibility of inferring several disk and stellar parameters through the follow-up of various observables. Here we study the temporal evolution of the disk density for different dynamical scenarios, including the disk buildup as a result of a long and steady mass injection from the star, the disk dissipation that occurs after mass injection is turned off, as well as scenarios in which active periods are followed by periods of quiescence. For those scenarios, we investigate the temporal evolution of continuum photometric observables using a three-dimensional non-LTE radiative transfer code. We show that light curves for different wavelengths are specific of a mass loss history, inclination angle, and alpha viscosity parameter. The diagnostic potential of those light curves is also discussed. (AU)

• Processo FAPESP: 09/54006-4 - Um cluster de computadores para o Departamento de Astronomia do IAG-USP e para o Núcleo de Astrofísica da UNICSUL
• Beneficiário: Elisabete Maria de Gouveia Dal Pino
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 10/19029-0 - Modelos tridimensionais de transporte radiativo: uma ponte entre teoria e observações
• Beneficiário: Alex Cavaliéri Carciofi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/16037-2 - Investigando a física de discos circunstelares a partir de modelos de transporte radiativo
• Beneficiário: Alex Cavaliéri Carciofi
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
• Processo FAPESP: 09/07477-1 - Sondagem das atmosferas e ambientes circunstelares de estrelas Be e de estrelas evoluídas através da interferometria e polarimetria
• Beneficiário: Xavier Marie Alain Haubois
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado