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The physical structure of NGC 2440

Published online by Cambridge University Press:  25 May 2016

L. Cuesta  and
J. P. Phillips
L. Cuesta
Affiliation:
1Instituto de Astrofísica de Canarias, La Laguna
J. P. Phillips
Affiliation:
2Instituto Nacional de Astrofísica, óptica y Electrónica, Mexico

Extract

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We have acquired monochromatic imaging of the bipolar outflow source NGC 2440 in 12 ionic transitions using the 1.5 m Telescope at the Observatorio de San Pedro Mártir, Ensenada, Baja California, Mexico. As a result, we have been able to undertake detailed analysis of the shell ionisation structure. Then, we found that excitation is high close the center, extending towards the exterior at located radial positions. Edges and ansae are zones of low excitation indicating probably shock regions, in particular the outer shell.

Type
IV. Envelopes
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 218
Copyright
Copyright © Kluwer 1997 

References

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