Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0205h&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #02.05; Bulletin of the American Astronomical Society, Vol. 25, p.784
Other
Scientific paper
Near-infrared spectra of several planetary nebulae (PN), including NGC 7026, IC 418, M 2-56, and AFGL 618 have been obtained using KSPEC, a new 1--2.5 microns spectrometer for the UH 2.2m telescope. The data have been used, along with broad-band near-IR imaging to understand the nature of the emission from these objects. The 1times 8 arcsec slit of KSPEC was used to obtain the spectrum of the PN at several positions, including the central star, the brightest part of the nebular ring or lobes, and the halo region if present. In the PN NGC 7026 and IC 418, the nebular emission is dominated by the hydrogen Paschen, Brackett, and Pfund series recombination lines, with contributions from several He I lines. The H line ratios are close to those predicted by recombination theory. Also present in the NGC 7026 spectrum is the H2 line at 2.122 microns and an unidentified line at 2.287 microns which has previously been detected in several other moderate- to high-excitation PN. No H2 is detected in the spectra of IC 418, and a previously reported Mg I line was also not seen. A strong continuum component is present in the 2--2.5 microns region, presumably due to hot dust emission. The bipolar PN M 2-56 has an almost featureless continuum from 1.15--2.5 microns. The spectrum of the protoplanetary nebula AFGL 618 is dominated by H2 lines, with Pabeta and Brgamma H recombination lines also detected.
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