Abstract
The ionisation structure of planetary nebulae (PNe) is investigated by means of monochromatic images in the strongest optical emission lines from the most abundant ionic species, and by means of optical and ultraviolet spectroscopy. These data are supplemented by high-resolution (R~105) spectroscopic observations which allow to map out the velocity fields in the nebular envelopes. This is particularly interesting since several nuclei show evidence for conspicuous supersonic winds, which could have a significant effect on the material ejected at much lower velocities during earlier evolutionary phases of the central stars. As this is an ongoing study, we present here preliminary results for two objects: NGC 3918 and NGC 2440.
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References
Clegg, R., Harrington, J., 1985:in, ‘Workshop on model nebulae’, ed. D. Pequignot, publication de l’Observatoire de Paris, 1986
Clegg, R. Harrington, J., Barlow, M.,Walsh, J., 1986, Astrophys. J. preprint
Pottasch, S., 1984; ‘Planetary Nebulae’, Ap. and Space Sci. Lib. Vol. 107, p. 296
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© 1987 D. Reidel Publishing Company
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Bianchi, L., Grewing, M., Falcetta, C., Baessgen, M. (1987). Ionisation and Dynamical Structure of Planetary Nebulae. In: Planetary and Proto-Planetary Nebulae: From IRAS to ISO. Astrophysics and Space Science Library, vol 135. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3891-5_18
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DOI: https://doi.org/10.1007/978-94-009-3891-5_18
Publisher Name: Springer, Dordrecht
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