Journal article

The etched hourglass nebula MyCn 18. I. Hubble Space Telescope observations

R Sahai, A Dayal, AM Watson, JT Trauger, KR Stapelfeldt, CJ Burrows, JS Gallagher, PA Scowen, JJ Hester, RW Evans, GE Ballester, JT Clarke, D Crisp, RE Griffiths, JG Hoessel, JA Holtzman, J Krist, JR Mould

Astronomical Journal | Published : 1999


We have obtained emission-line and continuum images of the young planetary nebula MyCn 18 with the Wide Field Planetary Camera 2 on the Hubble Space Telescope (HST). Although from the ground MyCn 18 appeared to have a triple-ring structure similar to SN 1987A, the HST images show that MyCn 18 has an overall hourglass shape. A series of arcs appear to be etched on the walls of the hourglass near its rims. In the complex central region of the nebula we find a small, inner hourglass structure and two rings. Ring 1 is a bright elliptical ring, and ring 2 a smaller, higher excitation ring. The outer and inner hourglass, and ring 1 and ring 2, all have different centers, and none are coincident wi..

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