The Anomalous Infrared Emission of Abell 58 | Zendy

J. Koller | Zendy; S. Kimeswenger | Zendy

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The Anomalous Infrared Emission of Abell 58

Author(s) -

J. Koller,

S. Kimeswenger

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/322407

Subject(s) - physics , infrared , radiative transfer , planetary nebula , astrophysics , knot (papermaking) , asymptotic giant branch , stars , infrared excess , astronomy , optics , materials science , composite material

We present a new model to explain the excess in mid and near infraredemission of the central, hydrogen poor dust knot in the planetary nebula (PN)Abell 58. Current models disagree with ISO measurement because they apply anaverage grain size and equilibrium conditions only. We investigate grain sizedistributions and temperature fluctuations affecting infrared emission using anew radiative transfer code and discuss in detail the conditions requiring anextension of the classical description. The peculiar infrared emission of V605Aql, the central dust knot in Abell 58, has been modeled with our code. V605Aql is of special interest as it is one of only three stars ever observed tomove from the evolutionary track of a central PN star back to the post-AGBstate.Comment: 17 pages, 4 figures; accepted and to be published in Ap

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