| Full text | |
| Author(s): |
Faes, D. M.
;
Carciofi, A. C.
;
Domiciano de Souza, A.
;
Sigut, TAA
;
Jones, CE
Total Authors: 5
|
| Document type: | Journal article |
| Source: | STARS WITH THE B[E] PHENOMENON, PROCEEDINGS; v. 506, p. 7-pg., 2016-01-01. |
| Abstract | |
Achernar is a key star to investigate the Be phemonemon. Its importance derives from the possibility of investigating in detail its photospheric and circumstellar emission due to its proximity. Since early 2013 the star entered a new outburst phase, having since then formed a large disk. Here we report our first results to model the recent disk evolution based on a recent precise photospheric characterization. The analysis combine multi-technique data, including broadband polarimetry (OPD/LNA), spectroscopy (FEROS and others) and interferometry (VLTVAMBER and PIONIER). The radiative transfer problem is solved by the HDUST code. The preliminary results indicate that the circumstellar disk was not formed by a constant mass injection, as indicated by the large variability in small temporal scales seen in polarization. Also, the forming disk manifests noticeable azimuthal asymmetries, as seen by the VI R variations in Ha, which suggests that mass ejection from the star is also non-axisymmetric. These elements offer a rare opportunity to evaluate the evolution of a just formed Be disk in detail and derive relevant physical quantities governing the system. (AU) | |
| FAPESP's process: | 12/04916-7 - An interferometric view on hot star disks |
| Grantee: | Daniel Moser Faes |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 10/19060-5 - An interferometric view on hot star disks |
| Grantee: | Daniel Moser Faes |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| 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 Opportunities: | Multi-user Equipment Program |