54 citations · 122 across the 4 of their papers we have counts for
7 papers
Protoplanetary disks in the hostile environment of Carina
A. Mesa-Delgado, L. Zapata, W. J. Henney +2
We report the first direct imaging of protoplanetary disks in the star-forming region of Carina, the most distant, massive cluster in which disks have been imaged. Using the Atacam…
Tangential Motions and Spectroscopy within NGC 6720, the Ring Nebula
C. R. O'Dell, W. J. Henney, F. Sabbadin
We have combined recent Hubble Space Telescope WFPC2 images in the [O III] 5007 and [N II] 6583 lines with similar images made 9.557 years earlier to determine the motion of the Ri…
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…