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Internal Motions of Faint PN Halos

Published online by Cambridge University Press:  19 July 2016

You-Hua Chu  and
George H. Jacoby
You-Hua Chu
Affiliation:
Astronomy Department, University of Illinois
George H. Jacoby
Affiliation:
Kitt Peak National Observatory

Extract

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We have obtained long-slit echelle observations of faint halos for 10 PNe - NGC 2022, 2438, 6210, 6309, 6543, 6720, 6751, 6826, 6891, and 7662. Only NGC 2022 and 6720 have linesplits indicative of a hollow expanding-shell structure. The others have observed FWHM ranging from 13 to 47 km/s in the [O III]λ5007 line, with an instrumental FWHM of 9–10 km/s. We have subtracted the instrumental and thermal widths and made geometric corrections to derive the expansion velocities.

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 198
Copyright
Copyright © Kluwer 1989