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Evolution of the disk in the Be binary $\delta$ Scorpii probed during three periastron passages by Rast, R. G.; Jones, C. E.; Carciofi, A. C.; Suffak, M. W.; Silva, A. C. F.; Henry, G. W.; Tycner, C. is a scholarly article available to read on EtoBox.

What is Evolution of the disk in the Be binary $\delta$ Scorpii probed during three periastron passages about?

We examine the evolution of the disk surrounding the Be star in the highly eccentric binary system $\delta$ Scorpii over its three most recent periastron passages. $V$-band and $B-V$ photometry, along with H$\alpha$ spectroscopy are combined with a new set of extensive multi-band polarimetry data to produce a detailed comparison of the disk's physical conditions during the time periods surrounding each closest approach of the secondary star. We use the three-dimensional Monte Carlo radiative transfer code \textsc{HDUST} and smoothed particle hydrodynamics (\textsc{SPH}) code to support our observations with models of disk evolution, discussing the behaviour of the H$\alpha$ and He\,\textsc{i} 6678 lines, $V$-band magnitude, and polarization degree. We compare the characteristics of the disk immediately before each periastron passage to create a baseline for the unperturbed disk. We find that the extent of the H$\alpha$ emitting region increased between each periastron passage, and that transient asymmetries in the disk become more pronounced with each successive encounter. Asymmetries of the H$\alpha$ and He\,\textsc{i} 6678 lines in 2011 indicate that perturbations propagate inwar

Author

Rast, R. G.; Jones, C. E.; Carciofi, A. C.; Suffak, M. W.; Silva, A. C. F.; Henry, G. W.; Tycner, C.

Published

2024

Language

EN