Open AccessThe spectrum of NGC 7027 (367-650 nm)
Author(s) -
L. H. Aller,
C. D. Keyes
Publication year - 1988
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.85.8.2417
Subject(s) - spectrograph , physics , line (geometry) , observatory , planetary nebula , detector , ion , spectrum (functional analysis) , nebula , astrophysics , optics , spectral line , analytical chemistry (journal) , chemistry , astronomy , geometry , stars , mathematics , chromatography , quantum mechanics
NGC 7027 shows the richest spectrum of any known gaseous nebula. In the region of the spectrum surveyed we have measured lines of ions of H, He, C, N, O, F, Ne, Mg, Si, P, S, Cl, Ar, K, Ca, Mn, and Fe using the new Hamilton Echelle Spectrograph of Lick Observatory with a charge-coupled device (CCD) detector. Since a CCD is a linear detector, whereas photographic emulsions used in the most comprehensive previous studies were not, a considerable enhancement in the accuracy of line intensity measurements is possible.
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