Internal Motions of Faint PN Halos
- 1 January 1989
- journal article
- Published by Cambridge University Press (CUP) in Symposium - International Astronomical Union
- Vol. 131, 198
- https://doi.org/10.1017/s0074180900138082
Abstract
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.Keywords
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