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2009MNRAS.400..575R - Mon. Not. R. Astron. Soc., 400, 575-588 (2009/December-1)
The haloes of planetary nebulae in the mid-infrared: evidence for interaction with the interstellar medium.
RAMOS-LARIOS G. and PHILLIPS J.P.
Abstract (from CDS):
NGC 2438 possesses strong scalloping at the outer limits of its asymptotic giant branch (AGB) halo, probably reflecting RT instabilities at the nebular/ISM interface We also note that the interior structure of the source has been interpreted in terms of a recombining shell, a hypothesis which may not be consistent with the central star luminosities.
Finally, we point out that two of the rims (and likely shock interfaces) appear to have a distinct signature in the MIR, whereby relative levels of 8.0µm emission are reduced. This may imply that the grain emission agents are depleted in the post-shock AGB regimes.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): instabilities - magnetic fields - ISM: jets and outflows - planetary nebulae - infrared: ISM
Simbad objects: 7
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