Computer Science – Numerical Analysis
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422..187d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 422, no. 1, p. 187-192
Computer Science
Numerical Analysis
14
Brightness, Bromine, Density (Number/Volume), Helium, Infrared Astronomy, Infrared Spectra, Planetary Nebulae, Stellar Temperature, Velocity Distribution, Data Integration, Infrared Imagery, Infrared Spectrometers, Infrared Telescopes, Numerical Analysis, Optical Filters
Scientific paper
We present the results of low-resolution (R = 30-100) spectroscopic observations of 12 planetary nebulae between 2.0 and 2.4 micrometer. The data were acquired with a slitless grism imaging system and hence measure emission from each nebula as a whole. The strongest nebular features in this bandpass are found to be He I 2.058 micrometer and Br gamma 2.166 micrometer, which appear in a ratio of He I/Br gamma ranging from less than 0.15 to 1.2. We have compared these measurements with photoionization calculations appropriate for planetary nebulae. The behavior of the He I is dictated in large part by the temperature Teff of the central star and the nebular density ne. Ratios of He I to Br gamma predicted for uniformly expanding nebulae tend to exceed observed values systematically at a given Teff and ne. This behavior can be plausibly accounted for by complex velocity structure within real nebulae.
DePoy Darren L.
Shields Joseph C.
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