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Astron. Astrophys. 325, 755-757 (1997)

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The spatial orientations of bipolar nebulae

J.P. Phillips

Instituto Nacional de Astrofisica, Optica y Electronica, A. Postal 51 y 216 Pue, Puebla, Mexico email: jpp@tonali.inaoep.mx

Received 1 April 1996 / Accepted 30 October 1996


We investigate the spatial orientation of mass outflow axes in post-main-sequence bipolar nebulae. As a consequence, some 71% of nebulae are found to have their outflow axes oriented within [FORMULA] of the Galactic plane; a distribution which has a probability level of [FORMULA]. There appear to be no clear mechanisms whereby such a non-random distribution may be explained.

Key words: planetary nebulae – structure – outflows

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998