| Title: |
Chandra View of Magnetically Confined Wind in HD191612: Theory versus Observations |
| Authors: |
Naze, Yael, ud-Doula, Asif, Zhekov, Svetozar A. |
| Source: |
ApJ, 831, 138 (11p, 2016) |
| Publication Year: |
2016 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - High Energy Astrophysical Phenomena |
| More Details: |
High-resolution spectra of the magnetic star HD191612 were acquired using the Chandra X-ray observatory at both maximum and minimum emission phases. We confirm the flux and hardness variations previously reported with XMM-Newton, demonstrating the great repeatability of the behavior of HD191612 over a decade. The line profiles appear typical for magnetic massive stars: no significant line shift, relatively narrow lines for high-Z elements, and formation radius at about 2R*. Line ratios confirm the softening of the X-ray spectrum at the minimum emission phase. Shift or width variations appear of limited amplitude at most (slightly lower velocity and slightly increased broadening at minimum emission phase, but within 1--2 sigma of values at maximum). In addition, a fully self-consistent 3D magnetohydrodynamic (MHD) simulation of the confined wind in HD191612 was performed. The simulation results were directly fitted to the data leading to a remarkable agreement overall between them.
Comment: accepted for publication in ApJ |
| Document Type: |
Working Paper |
| DOI: |
10.3847/0004-637X/831/2/138 |
| Access URL: |
http://arxiv.org/abs/1608.08741 |
| Accession Number: |
edsarx.1608.08741 |
| Database: |
arXiv |
