| Autor: | Alaa Ali, M. S. El-Nawawy, J. Pfleiderer |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Physics
Reflection nebula Astrophysics::High Energy Astrophysical Phenomena Astronomy Astronomy and Astrophysics Astrophysics Galactic plane Planetary nebula Cosmology Magnetic field Interstellar medium Space and Planetary Science Dark nebula Orientation (geometry) Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Astrophysics and Space Science. 271:245-258 |
| ISSN: | 0004-640X |
| DOI: | 10.1023/a:1002442632274 |
| Popis: | We have investigated the spatial orientation of one-sided Planetary Nebulae. Most of them if not all are interacting with the interstellar medium. Seventy percent of the nebulae in our sample have inclination angles larger than 45° to the galactic plane and 30% of the inclination angles are less than 45°. Most of the selected objects are old, evolved planetary nebulae with large dimensions, and not far away from the galactic plane. Seventy-five percent of the objects are within 160 pc from the galactic plane. The enhanced concavity arc can be explained physically as a result of the `planetary nebulae – interstellar matter' interaction. We have discussed the possible effect of the interstellar magnetic field in the concavity regions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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