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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

DYNAMICAL EVOLUTION OF VISCOUS DISKS AROUND BE STARS. II. POLARIMETRY

Texto completo
Autor(es):
Haubois, X. [1, 2, 3] ; Mota, B. C. [1] ; Carciofi, A. C. [1] ; Draper, Z. H. [4, 5] ; Wisniewski, J. P. [6] ; Bednarski, D. [1] ; Rivinius, Th [7]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil
[2] Univ Paris Diderot, UPMC, CNRS UMR 8109, Observ Paris, LESIA, F-92195 Meudon - France
[3] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006 - Australia
[4] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2 - Canada
[5] Natl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9E 2E7 - Canada
[6] Univ Oklahoma, HL Dodge Dept Phys & Astron, Norman, OK 73019 - USA
[7] European Org Astron Res Southern Hemisphere, Santiago 19 - Chile
Número total de Afiliações: 7
Tipo de documento: Artigo Científico
Fonte: ASTROPHYSICAL JOURNAL; v. 785, n. 1 APR 10 2014.
Citações Web of Science: 17
Resumo

Be stars exhibit variability for a great number of observables. Putting the pieces of the disk dynamics together is not an easy task and requires arduous modeling before achieving a good fit to the observational data. In order to guide the modeling process and make it more efficient, it is very instructive to investigate reference dynamical cases. This paper focuses on continuum polarimetric quantities and is the second of a series that aims to demonstrate the capacity of deriving the dynamical history and fundamental parameters of a classical Be star through follow-up of various observables. After a detailed study of the different opacities at play in the formation of polarized spectra, we investigate predictions of polarimetric observables in the continuum for different dynamical scenarios. Our models are based on a coupling of a hydrodynamic viscous decretion simulations in a disk and a three-dimensional non-LTE radiative transfer code. Through introduction of the polarization color diagram (PCD), we show that certain combinations of polarimetric observables exhibit features that are characteristic of a mass-loss history. This diagram also enables estimates of fundamental parameters such as the inclination angle, disk density scale, and the a viscous diffusion parameter. We present the PCD as a powerful diagnosis tool to track the dynamical phases of a Be star, such as disk build-up, dissipation, periodic, and episodic outbursts. Finally, we confront our models with observations of four Be stars that exhibited long-term polarimetric activity. (AU)

Processo FAPESP: 10/19029-0 - Modelos tridimensionais de transporte radiativo: uma ponte entre teoria e observações
Beneficiário:Alex Cavaliéri Carciofi
Linha de fomento: Auxílio à Pesquisa - Regular
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
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
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
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários