The Anomalous Infrared Emission of Abell 58

Abstract

We present a new model to explain the excess in mid and near infrared emission of the central, hydrogen poor dust knot in the planetary nebula (PN) Abell 58. Current models disagree with ISO measurement because they apply an average grain size and equilibrium conditions only. We investigate grain size distributions and temperature fluctuations affecting infrared emission using a new radiative transfer code and discuss in detail the conditions requiring an extension of the classical description. The peculiar infrared emission of V605 Aql, the central dust knot in Abell 58, has been modeled with our code. V605 Aql is of special interest as it is one of only three stars ever observed to move from the evolutionary track of a central PN star back to the post-AGB state.

17 pages, 4 figures; accepted and to be published in ApJ

Cited by in corpus (10)

• The peculiar variable V838 Mon
• Catalogue of central stars of planetary nebulae: Expanded edition
• Evolution of the 1919 Ejecta of V605 Aquilae
• V4332 Sgr in 'Quiescence'
• Carbon dust in the evolved born-again planetary nebulae A30 and A78
• XSHOOTER spectroscopy of the enigmatic planetary nebula Lin49 in the Small Magellanic Cloud
• The progenitor of the 'born-again' core V605 Aql and the relation to its younger twin V4334 Sgr
• First images of the molecular gas around a born-again star revealed by ALMA
• Recombination of hot ionized nebulae: The old planetary nebula around V4334 Sgr (Sakurai's star)
• Is the nitrogen-rich source PN K4-47 a true planetary nebula?