Orientation effects in Bipolar nebulae
| dc.creator | Schwarz, Hugo E. | |
| dc.creator | Monteiro, Hektor | |
| dc.creator | Peterson, Ryan | |
| dc.date | 2006-09-17 | |
| dc.date.accessioned | 2026-07-07T07:23:15Z | |
| dc.date.available | 2026-07-07T07:23:15Z | |
| dc.description | We show that the inclination to the line of sight of bipolar nebulae strongly affects some of their observed properties. We model these objects as having a spherically symmetric Planetary Nebula and a dusty equatorial density enhancement that produces extinction that varies with the viewing angle. Our sample of 29 nebulae taken from the literature shows a clear correlation between the inclination angle and the near-IR and optical photometric properties as well as the apparent luminosity of the objects. As the inclination angle increases --the viewing angle is closer to the equatorial plane-- the objects become redder, their average apparent luminosity decreases, and their average projected expansion velocity becomes smaller. We compute two-dimensional models of stars embedded in dusty disks of various shapes and compositions and show that the observed data can be reproduced by disk-star combinations with reasonable parameters. To compare with the observational data, we generate sets of model data by randomly varying the star and disk parameters within a physically meaningful range. We conclude that a only a smooth pole to equator density gradient agrees with the observed phenomena and that thin, equatorially concentrated disks can be discarded. | |
| dc.description | Submitted to ApJ, 10pp, 6 Figs | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0609467 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0609467 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/115913 | |
| dc.subject | Astrophysics | |
| dc.title | Orientation effects in Bipolar nebulae | |
| dc.type | text |