Revealing the Photodissociation Region:HST/NICMOS Imaging of NGC 7027 | Zendy

William B. Latter | Zendy; Aditya Dayal | Zendy; John H. Bieging | Zendy; Casey Meakin | Zendy; Joseph L. Hora | Zendy; Douglas Kelly | Zendy; A. G. G. M. Tielens | Zendy

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Revealing the Photodissociation Region:HST/NICMOS Imaging of NGC 7027

Author(s) -

William B. Latter,

Aditya Dayal,

John H. Bieging,

Casey Meakin,

Joseph L. Hora,

Douglas Kelly,

A. G. G. M. Tielens

Publication year - 2000

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 - 10.1086/309252

Subject(s) - planetary nebula , physics , astrophysics , photodissociation , infrared , astronomy , nebula , hubble space telescope , stars , chemistry , photochemistry

We report results from a Hubble Space Telescope (HST) and Near-InfraredCamera and Multiobject Spectrometer (NICMOS) program to study the distributionof hot neutral (molecular hydrogen) and ionized circumstellar material in theyoung planetary nebulae NGC 7027. HST/NICMOS provided very high spatialresolution imaging in line and continuum emission, and the stability and largedynamic range needed for investigating detailed structures in the circumstellarmaterial. We present dramatic new images of NGC 7027 that have led to a newunderstanding of the structure in this important planetary nebula. The centralstar is clearly revealed, providing near-infrared fluxes that are used todirectly determine the stellar temperature very accurately (T = 198,000 K). Itis found that the photodissociation layer as revealed by near-infraredmolecular hydrogen emission is very thin, and is biconical in shape. Theinterface region is structured and filamentary, suggesting the existence ofhydrodynamic instabilities. We discuss evidence for the presence of one or morehighly collimated, off-axis jets that might be present in NGC 7027. Theevolutionary future of NGC 7027 is discussed.Comment: Astrophysical Journal, in pres

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