22 citations · 26 across the 2 of their papers we have counts for
6 papers
Independent Emission and Absorption Abundances for Planetary Nebulae
Robert Williams, Edward B. Jenkins, Jack A. Baldwin +4
Emission-line abundances have been uncertain for more than a decade due to unexplained discrepancies in the relative intensities of the forbidden lines and weak permitted recombina…
Abundances of s-process elements in planetary nebulae: Br, Kr & Xe
Y. Zhang, R. Williams, E. Pellegrini +5
We identify emission lines of post-iron peak elements in very high signal-to-noise spectra of a sample of planetary nebulae. Analysis of lines from ions of Kr and Xe reveals enhanc…
Identification and Characterization of Faint Emission Lines in the Spectrum of the Planetary Nebula IC 418
Brian Sharpee, Jack A. Baldwin, Robert Williams
We present high signal-to-noise echelle spectra of the compact high surface brightness, low ionization planetary nebula IC 418. These reveal 807 emission lines down to intensities…
Measurements of the Singly Ionized Oxygen Auroral Doublet Lines 7320,7330ÅUsing High Resolution Sky Spectra
Brian D. Sharpee, Tom G. Slanger, David L. Huestis +1
The wavelengths of the individual [O II] 2s22p3 2Do(5/2) - 2s22p3 2Po(1/2,3/2) 7320Åand [O II] 2s22p3 2Do(3/2) - 2s22p3 2Po(1/2,3/2) 7330Åauroral doublet component lines have been…
Introducing EMILI: Computer Aided Emission Line Identification
Brian Sharpee, Robert Williams, Jack A. Baldwin +1
The identification of spectral lines can be a tedious process requiring the interrogation of large spectroscopic databases, but it does lend itself to software algorithms that can…
Comparative Absorption and Emission Abundance Analyses of Nebulae: Ion Emission Densities for IC 418
Robert Williams, Edward B. Jenkins, Jack A. Baldwin +1
Recent analyses of nebular spectra have resulted in discrepant abundances from CNO forbidden and recombination lines. We consider independent methods of determining ion abundances…