The spectrum of the planetary nebula NGC 7027 from 0.9 to 2.7 microns.

The spectrum of the planetary nebula NGC 7027 is presented from 0.9 to 2.7 . 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 `S-2 `P line at 2.058 , have been observed. It is concluded that the nebula is optically thick in the helium principal series. A tentative identification of an emission line of [P ii] at 1.1898 IL has also been made. Subject headings: infrared: spectra - line identifications - nebulae: planetary