54 citations · 221 across the 8 of their papers we have counts for
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Velocity Structure in the Orion Nebula. II. Emission Line Atlas of Partially Ionized to Fully Ionized Gas
Ma. T. García-Díaz, W. J. Henney, J. A. López +2
We present an atlas of three-dimensional (position-position-velocity) spectra of the Orion Nebula in optical emission lines from a variety of different ionization stages: [O I] 630…
Enrichment of the ISM by metal-rich droplets and the abundance bias in HII regions
Grazyna Stasinska, Guillermo Tenorio-Tagle, Monica Rodriguez +1
We critically examine a scenario for the enrichment of the interstellar medium (ISM) in which supernova ejecta follow a long (10^8 yr) journey before falling back onto the galactic…
Determination of the Physical Conditions of the Knots in the Helix Nebula from Optical and Infrared Observations
C. R. O'Dell, W. J. Henney, G. J. Ferland
[Abridged] We use new HST and archived images to clarify the nature of the knots in the Helix Nebula. We employ published far infrared spectrophotometry and existing 2.12 micron im…
A Multi-Instrument Study of the Helix Nebula Knots with the Hubble Space Telescope
C. R. O'Dell, W. J. Henney, G. J. Ferland
We have conducted a combined observational and theoretical investigation of the ubiquitous knots in the Helix Nebula (NGC 7293). We have constructed a combined hydrodynamic+radiati…
Doppler Ghosts in a Hall of Mirrors: Polarisation Profiles of Scattered Emission Lines
W. J. Henney
The Doppler shifts of optical emission lines which have been scattered by surrounding dust and electrons can provide useful information about the kinematics, geometry and physical…