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Planetary and Proto-Planetary Nebulae Which are Strong 25μm Emitters

Published online by Cambridge University Press:  07 August 2017

R.D. Wolstencroft
Affiliation:
Royal Observatory, Edinburgh EH9 3HJ, UK
M.A. Read
Affiliation:
Royal Observatory, Edinburgh EH9 3HJ, UK
S.M. Scarrott
Affiliation:
Dept. of Physics, University of Durham, Durham DH1 3LE, UK
C.J. Lonsdale
Affiliation:
IPAC, MS 100-22, Caltech, Pasadena, California 91125, USA
Q.A. Parker
Affiliation:
Anglo-Australian Observatory, Coonabarabran, NSW, Australia

Extract

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The IRAS Point Source Catalogue containing about 250,000 sources has yielded a large number of previously unknown planetary nebulae (PNe) and a smaller number of proto-planetary nebulae (PPNe). The spectral energy distributions for many of these objects peak at or close to 25μm. A program to optically identify sources in the complete IRAS Faint Source Database, which comprises about 750,000 sources, is currently under way (Wolstencroft et al. 1991), and in a related study Wolstencroft, Parker & Lonsdale are carrying out a spectroscopic survey of a small sample of the approximately 106,000 sources which either peak or are detected only at 25μm. So far spectra of 150 sources have been obtained: 3 of these sources are PNe and 1 is a PPNe. This suggests that this sample of 25μm emitters may be a rich source of new PNe and PPNe. In this note we discuss two of these four sources.

Type
I. The Observational PN Database
Copyright
Copyright © Kluwer 1993 

References

Jacoby, G.H. (1981) Astrophys. J. 244, 903911.Google Scholar
Osterbrock, D.E. (1989) In ‘Astrophysics of Gaseous Nebulae and Active Galactic Nuclei’, Ch. 7, University Science, California.Google Scholar
Scarrott, S.M. et al. (1990) MNRAS 245, 484492.Google Scholar
Wolstencroft, R.D. et al. (1991) In ‘Digitised Optical Sky Surveys’, Kluwer, Dordrecht, pp 471483.Google Scholar