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- W1996584100 abstract "The spectrum of the planetary nebula NGC 7027 in the range 1.6-2.5 microns was obtained with a resolution of 1.2 per cm. The presence of molecular hydrogen emission in the v = 1-0 S(1), Q(1), and Q(3) lines is confirmed, and the detection of H2 lines v = 1-0 Q(2), Q(4), S(0), and S(2) is reported. The H2 line strengths, with upper limits for the v = 2-1 band, suggest a model in which the emitting gas is confined to clumps heated by a shock front accompanying an expanding H II region. Emission lines are also detected from atomic hydrogen (Pfund and Brackett series) and from He I and He II." @default.
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- W1996584100 date "1981-03-01" @default.
- W1996584100 modified "2023-09-26" @default.
- W1996584100 title "Molecular hydrogen and the 2 micron spectrum of NGC 7027" @default.
- W1996584100 doi "https://doi.org/10.1086/158758" @default.
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