The spectrum of the planetary nebula NGC 7027 from 0. 9 to 2. 7 microns

Journal Article · Mon Nov 01 04:00:00 EST 1976 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/154777· OSTI ID:7137143

Treffers, R R; Fink, U; Larson, H P; Gautier, III, T N

The spectrum of the planetary nebula NGC 7027 is presented from 0.9 to 2.7 ..mu... Emission lines of the Brackett and Paschen series of hydrogen and of ionized helium have been detected, and the intensities are shown to be consistent with the theory of radiative recombination. Three lines of the 1-0 quadrupole spectrum of molecular hydrogen have been detected. Four lines of He I, including the 2 /sup 1/S/sup -/ 2 /sup 1/P line at 2.058 ..mu.., have been observed. It is concluded that the nebula is optically thick in the helium principal series. A tentative identification of an emission line in (P II) at 1.1898 ..mu.. has also been made. (AIP)

• Research Organization: Lunar and Planetary Laboratory, University of Arizona
• OSTI ID: 7137143
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 209:3; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BALMER LINES
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
FLUIDS
FORBIDDEN TRANSITIONS
HELIUM
HYDROGEN
INFRARED RADIATION
NEBULAE
NONMETALS
PLANETARY NEBULAE
RADIATIONS
RARE GASES
SPECTRA