Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989msngr..58....9s&link_type=abstract
The Messenger, vol. 58, p. 9-10
Physics
Planetary Nebulae: H Alpha, Planetary Nebulae: Halos
Scientific paper
The 3.5-m Nl7 with EFOSC2 has been used to make images of about 280 planetary nebulae (PN) in two narrow passbands centred on Ha and [OIII] 5007. These data will be published in the near future in the form of a pictorial atlas. Since both [OIII] and Ha images were taken, a map of the high excitation gas can be made by dividing the frames; an example has been presented by (1).
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