Near-Infrared Unidentified-Line Morphology of the Planetary Nebula NGC 7027

Details Near-Infrared Unidentified-Line Morphology of the Planetary Nebula NGC 7027 Near-Infrared Unidentified-Line Morphology of the Planetary Nebula NGC 7027

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..705o&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.56, No.4, pp. 705-709

Astronomy and Astrophysics

Astronomy

1

Infrared: Ism, Ism: Lines And Bands, Ism: Planetary Nebulae: Individual (Ngc 7027), Line: Identification, Radiation Mechanisms: General

Scientific paper

Medium-resolution (R ˜ 500), K-band two-dimensional spectra are presented for the planetary nebula NGC 7027. The spatial distributions for the two bright unidentified lines near 2.199 and 2.287 μm were revealed and examined compared to those of other emission lines. It was spatially confirmed that the unidentified lines do not arise from neutral molecules, but ionized species. The ionization potentials of their parent ions are lower than that of He II, and comparable to or higher than that of Brγ. Our results support the previous studies of identification of parent species, on the condition that the carriers of the unidentified lines are partly excited by collisions.

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