Parameters of PNe: constant density versus density distribution
| dc.creator | Kraus, Michaela | |
| dc.date | 2004-07-14 | |
| dc.date | 2004-12-16 | |
| dc.date.accessioned | 2026-07-07T02:13:51Z | |
| dc.date.available | 2026-07-07T02:13:51Z | |
| dc.description | We derive the stellar and circumstellar parameters of the Galactic compact planetary nebula Hen 2-90 with two models: the classical constant density nebula model where the emission (especially of the forbiden lines) is formed in a sphere or shell of constant density, and a model where the emission is formed in a shell with a $r^{-2}$ density distribution. Depending on the density $N_{\rm e,0}$ in the second model, the resulting range of valid values can deviate from the classical model results. This seems to be especially true for elemental abundances as is shown exemplary for S$^{+}$. We find that the abundance of S$^{+}$ is larger for the models with density distribution than for a constant density. A careful analysis of data with an appropriate input model is advisable when determining stellar and circumstellar parameters of planetary nebulae not only in our Galaxy. | |
| dc.description | 5 pages, 4 figures, to appear in the proceedings of "Planetary Nebulae beyond the Milky Way" eds. J.R.Walsh & L. Stanghellini, revised version, figures new | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0407292 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0407292 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/7953 | |
| dc.subject | Astrophysics | |
| dc.title | Parameters of PNe: constant density versus density distribution | |
| dc.type | text |