Unexpected bi-polar motions in the planetary nebula NGC 1535

Details Unexpected bi-polar motions in the planetary nebula NGC 1535 Unexpected bi-polar motions in the planetary nebula NGC 1535

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195..263c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 263-268.

Astronomy and Astrophysics

Astrophysics

3

Fabry-Perot Interferometers, Interstellar Matter, Planetary Nebulae, Stellar Winds, Emission Spectra, Line Of Sight, Line Spectra, Spectral Resolution

Scientific paper

Echelle spectroscopy of the inner shell of the bright planetary nebula NGC 1535 has revealed a bi-polar expansion with velocities of over 20 km s-1. This is unexpected since this object exhibits a round morphology. Current theories which invoke stellar winds as the dominant force shaping PN are found to be consistent both quantitatively and qualitatively with the observed phenomenon and a model is suggested in which preferential expansion occurs due to the partial collimation of a stellar wind by a ring of dense material in the equatorial plane which was most likely released by the progenitor during an earlier stage of its evolution.

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