| Full text | |
| Author(s): |
Rast, R. G.
;
Jones, C. E.
;
Carciofi, A. C.
;
Suffak, M. W.
;
Silva, A. C. Fonseca
;
Henry, G. W.
;
Tycner, C.
Total Authors: 7
|
| Document type: | Journal article |
| Source: | ASTROPHYSICAL JOURNAL; v. 968, n. 1, p. 16-pg., 2024-06-01. |
| Abstract | |
We examine the evolution of the disk surrounding the Be star in the highly eccentric 10.8 yr 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 multiband 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 HDUST and a smoothed particle hydrodynamics code to support our observations with models of disk evolution, discussing the behavior of the H alpha and He i 6678 & Aring; 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 i 6678 & Aring; lines in 2011 indicate that perturbations propagate inward through the disk near periastron. When the disk's direction of orbit is opposite to that of the secondary, the parameters used in our models do not produce spiral density enhancements in the H alpha emitting region because the tidal interaction time is short due to the relative velocities of the disk particles with the secondary. The effects of the secondary star on the disk are short-lived and the disk shows independent evolution between each periastron event. (AU) | |
| FAPESP's process: | 18/04055-8 - High precision spectroscopy: from the first stars to planets |
| Grantee: | Jorge Luis Melendez Moreno |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/13354-1 - Decretion disks and outflows around fast-spinning stars |
| Grantee: | Alex Cavaliéri Carciofi |
| Support Opportunities: | Regular Research Grants |