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IC 4406 is a planetary nebula near the western border of the constellation Lupus, the Wolf. It has dust clouds and has the shape of a torus. Despite this, it looks somewhat rectangular because it is seen from its side as viewed from Earth, almost in the plane[2] of its equator.
Structure
IC 4406 is bipolar and appears to be a prolate spheroid with strong concentrations of material in its equator.[3] This kind of structure is a natural product of a bipolar model.[3] The knots of IC 4406 have a "lacy" appearance and have no ordered symmetry towards the central star.[2] The knots have no tails.[2] None of the features have bright edges.[2]
References
- ^ a b "SIMBAD Astronomical Database". Results for IC 4406. Retrieved on 2006-12-19.
- ^ a b c d e O'dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (2003). "Knots in Planetary Nebulae". Winds, Bubbles, and Explosions: a conference to honor John Dyson, Pátzcuaro, Michoacán, México, September 9-13, 2002 (Eds. S. J. Arthur & W. J. Henney) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) (http://www.astroscu.unam.mx/~rmaa/) 15: 29-33. http://adsabs.harvard.edu/cgi-bin/nph-bib_query-bibcode=2003RMxAC..15...29O.
- ^ a b c O'Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal 123 (6): 3329-3347. doi:10.1086/340726. http://adsabs.harvard.edu/cgi-bin/nph-bib_query-bibcode=2002AJ....123.3329O.
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