Spiral Density Enhancements in Be Binary Systems
| Autor: | Isabelle H. Cyr, C Steckel, Christopher Tycner, Alex C. Carciofi, Carol E. Jones, Atsuo T. Okazaki |
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| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
Physics Orbital plane Spiral galaxy Be star ASTROFÍSICA ESTELAR Phase (waves) Binary number FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Computational physics Smoothed-particle hydrodynamics 03 medical and health sciences 030104 developmental biology Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Orientation (geometry) 0103 physical sciences Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Spiral Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| DOI: | 10.48550/arxiv.2107.06230 |
| Popis: | We use a smoothed particle hydrodynamics (SPH) code to examine the effects of a binary companion on a Be star disk for a range of disk viscosities and misalignment angles, i.e. the angle between the orbital plane and the primary's spin axis. The density structures in the disk due to the tidal interaction with the binary companion are investigated. Expanding on our previous work, the shape and density structure of density enhancements due to the binary companion are analyzed and the changes in observed interferometric features due to these orbiting enhancements are also predicted. We find that larger misalignment angles and viscosity values result in more tightly wound spiral arms with densities that fall-off more slowly with radial distance from the central star. We show that the orbital phase has very little effect on the structure of the spiral density enhancements. We demonstrate that these spiral features can be detected with an interferometer in H$\alpha$ and K-band emission. We also show that the spiral features affect the axis ratios determined by interferometry depending on the orientation of these features and the observer. For example, our simulations show that the axis ratios can vary by 20% for our co-planar binary disk system depending on the location of the disk density enhancements. Comment: 13 pages, 14 figures |
| Databáze: | OpenAIRE |
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