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IRAS Observations of Extended Planetary Nebulae

Published online by Cambridge University Press:  19 July 2016

A. Leene  and
S. R. Pottasch
A. Leene
Affiliation:
Kapteyn Astronomical Institute, Groningen, the Netherlands
S. R. Pottasch
Affiliation:
Kapteyn Astronomical Institute, Groningen, the Netherlands

Extract

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The pointed observations made by the IRAS satellite have been analysed. In total 67 nebulae have been observed of which 10 proved to be resolved. The majority of the observations were carried out with the CPC and with the DSD macro of the survey array (Leene & Pottasch, 1987b). Further special deep maps were made of six nebulae (Leene & Pottasch, 1987a; Leene, 1987). Typical noise levels of the deep images are 0.03–0.1 MJy ster−1.

The distribution of emission around the central star confirms that the 12 and 25 μm emission are due to ionic line emission. This is very clear in the nebula NGC 7293 (Leene & Pottasch, 1987a) and in NGC 6853 (Zhang et al., 1987). The other nebulae (A7, A21, A31, A35 and NGC 1360) confirm these findings. The 12 μm emission is most likely due to the NeII (12.81 μm) or due to the SIV (10.52 μm) line. The 25 μm band shows a strong central contribution due to the OIV (25.87 μm) line and a halo of the SIII (18.68 μm) line.

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 174
Copyright
Copyright © Kluwer 1989 

References

Barlow, M.J.: 1983, IAU Symp. 103, p105, Reidel Google Scholar
Leene, A., Pottasch, S.R.: 1987a, Astron. Astrophys. 173, 145 Google Scholar
Leene, A., Pottasch, S.R.: 1987b, submitted to Astron. Astrophys. Google Scholar
Leene, A.: 1987, , University Groningen, The Netherlands.Google Scholar
van der Veen, W., Habing, H.J., Geballe, T.: 1987, “Planetary and proto-planetary nebulae: from IRAS to ISO”, p69, ed. Preite-Martinez, A., Reidel CrossRefGoogle Scholar
Zhang, C.Y., Leene, A., Pottasch, S.R., Mo, J.E.: 1987, Astron. Astrophys. 178, 247 Google Scholar