Hydrogen-poor planetary nebulae
| dc.creator | Zijlstra, Albert A. | |
| dc.date | 2001-05-25 | |
| dc.date.accessioned | 2026-07-07T01:58:41Z | |
| dc.date.available | 2026-07-07T01:58:41Z | |
| dc.description | Five planetary nebulae are known to show hydrogen-poor material near the central star. In the case of A58, this gas was ejected following a late thermal pulse similar to Sakurai's Object. In this paper I will review these five objects. One of them, IRAS 18333$-$2357, may not be a true PN. I will show that there is a strong case for a relation to the [WC] stars and their relatives, the weak emission-line stars. The surface abundances of the [WC] stars are explained via diffuse overshoot into the helium layer. The hydrogen-poor PNe do not support this: their abundances indicate a change of abundance with depth in the helium layer. A short-lived phase of very high mass loss, the r-AGB, is indicated. Sakurai's Object may be at the start of such a phase, and may evolve to very low stellar temperatures. | |
| dc.description | 12 pages, 3 figures. Invited review: Sakurai's object: What have we learned in the first five years?(Keele, UK). To be published in Astrophysics & Space Science | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0105448 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0105448 | |
| dc.identifier | Astrophys.Space Sci. 279 (2002) 171-182 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/2814 | |
| dc.subject | Astrophysics | |
| dc.title | Hydrogen-poor planetary nebulae | |
| dc.type | text |