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Near-infrared spectroscopy of (proto)-planetary nebulae: molecular hydrogen excitation as an evolutionary tracer

Authors
  • Christopher J, Davis
  • Michael D, Smith
  • Luke, Stern
  • Thomas H, Kerr
  • Jean Chiar
Type
Published Article
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press
Publication Date
Aug 31, 2003
Volume
344
Issue
1
Pages
262–282
Source
SETI Institute
License
Unknown

Abstract

We present an in-depth analysis of molecular excitation in 11 H 2-bright planetary and protoplanetary nebulae (PN and PPN). From newly acquired K-band observations, we extract a number of spectra at positions across each source. H 2 line intensities are plotted on column density ratio diagrams so that we may examine the excitation in and across each region. To achieve this, we combine the shock models of Smith, Khanzadyan & Davis with the photodissociation region (PDR) models of Black & van Dishoeck to yield a shock-plus- ...

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