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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Haubois, X. [1] ; Carciofi, A. C. [1] ; Rivinius, Th [2] ; Okazaki, A. T. [3] ; Bjorkman, J. E. [4]
Total Authors: 5
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: ASTROPHYSICAL JOURNAL; v. 756, n. 2 SEP 10 2012.
Web of Science Citations: 57
Abstract

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)

FAPESP's process: 10/19029-0 - 3D radiative transfer models: bridging theory and observations
Grantee:Alex Cavaliéri Carciofi
Support type: Regular Research Grants
FAPESP's process: 09/07477-1 - Probing atmospheres and circumstellar environments of Be stars and evolved low mass stars with interferometry and polarimetry
Grantee:Xavier Marie Alain Haubois
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 10/16037-2 - 3D NLTE radiative transfer models for testing circumstellar disk physics
Grantee:Alex Cavaliéri Carciofi
Support type: Research Grants - Visiting Researcher Grant - International
FAPESP's process: 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Multi-user Equipment Program