Near Infrared Emission Lines From Compact Planetary Nebulae: H2 and [Fe III]

Details Near Infrared Emission Lines From Compact Planetary Nebulae: H2 and [Fe III] Near Infrared Emission Lines From Compact Planetary Nebulae: H2 and [Fe III]

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..313..351l&link_type=abstract

Asymmetrical Planetary Nebulae III: Winds, Structure and the Thunderbird, Proceedings of the conference held 28 July - 1 August

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We discuss our near-infrared (K-band) observations of planetary nebulae, and present new spectra of M 1-13, SwSt 1, and Vy 2-2. These objects show H2 emission, which is especially strong relative to Brackett γ in M 1-13. Ratios among K-band H2 lines are commonly used as diagnostics of the excitation mechanism. In most cases our observations indicate contributions from both radiative and collisional excitation, or collisional modification of radiatively-excited H2, although shock excitation may dominate for M 1-13 and IC 5117. In Vy 2-2 and SwSt 1, we detect two [Fe III] lines at strengths suggesting that the gas-phase iron depletion in these nebulae is less extreme than in the cold ISM.

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