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| Paper: |
The Recent Disk Evolution of Achernar |
| Volume: |
506, Bright Emissaries: Be Stars as Messengers of Star-Disk Physics |
| Page: |
55 |
| Authors: |
Faes, D. M.; Carciofi, A. C.; de Souza, A. D. |
| 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 (VLTI/AMBER 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 V/R variations in Hα,
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. |
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