Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5607l&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #56.07D; Bulletin of the American Astronomical Society, Vol. 24, p.1214
Astronomy and Astrophysics
Astronomy
Scientific paper
Previous studies of the Crab Nebula, Cas A and Nova GK Persei have shown that these objects have significant asymmetries and anisotropies in their filamentary structures, velocity fields and elemental abundance distributions. This work expands our views of these objects into three dimensions using the first complete Fabry-Perot imaging scans of their filamentary emission. The Goddard Astronomical Fabry-Perot Imaging Camera was used at the Michigan-Dartmouth-MIT Observatory 1.3m and 2.4m telescopes to scan through the Doppler-broadened line profiles of these objects, generating data cubes in alpha -delta -lambda (position-wavelength) space. By assuming object distances and constant radial velocities, these cubes were translated into three-dimensional spatial models. The primary focus of this work is on the Crab Nebula, using Hβ , He I lambda 5876 and [OIII] lambda 5007 emission with 150 km s(-1) resolution. The models reveal many details of the overall filamentary network, including the toroidal structure of the high-helium region, organization of the brightest filaments into ``meridians'' about an axis nearly aligned with the line-of-sight to the Earth, and significant anisotropy in the three-dimensional He/H abundance distribution. The latter is used to refine lower limits on the filamentary mass of the nebula. For Cas A, the distribution of the quasi-stationary flocculi is derived from Hα \ + [NII] lambda lambda 6548, 6583 emission with 150 km s(-1) resolution, and the distribution of the fast-moving knots from [SII] lambda lambda 6717, 6731 emission with 550 km s(-1) resolution. For Nova GK Persei, a model is constructed from Hα \ + [NII] lambda lambda 6548, 6583 emission with a resolution of 150 km s(-1) .
Lawrence Stephen
MacAlpine Gordon
Uomoto Alan
Woodgate Bruce
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