Birth and early evolution of a planetary nebula

Common Envelope Evolution through Planetary Nebula Eyes

The common envelope interaction is responsible for evolved close binaries. Among them are a minority of central stars of planetary nebula (PN). Recent observational results, however, point to most PN actually being in binary systems. We therefore ask the question if it is feasible that most, or even all Galactic PN derive from a common envelope interaction. Our recent calculation finds that if ...

ar X iv : a st ro - p h / 98 04 02 2 v 1 2 A pr 1 99 8 Birth and early evolution of a planetary nebula

Evolution from AGB to planetary nebula in the MSX survey ⋆ ⋆ ⋆

We investigate the evolution of oxygen-and carbon-rich AGB stars, post-AGB objects, and planetary nebulae using data collected mainly from the MSX catalogue. Magnitudes and colour indices are compared with those calculated from a grid of synthetic spectra that describe the post-AGB evolution beginning at the onset of the superwind. We find that carbon stars and OH/IR objects form two distinct s...

a model for the dynamical and ionization structure of planetary nebula ic 418

the interacting two winds model and a spherical density distribution function are introduced to study the dynamical and ionization structure of the planetary nebula ic 418. a fast wind with a mechanical luminousity  2/34×1034erg.s-1 of interacts with a super wind with a mass-loss rate of  2×10-5m(°)yr-1 and  a velocity of 10 , and produces a dense and luminous medium.   in this model, the expan...

The Planetary Nebula Luminosity Function

The [O III] λ5007 planetary nebula luminosity function (PNLF) occupies an important place on the extragalactic distance ladder: it is the only standard candle that can be applied to all the large galaxies of the Local Supercluster. We review the method’s precision, and use it to show that the distance scale defined by Cepheids and the Surface Brightness Fluctuation method is likely too large by...