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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 ,
M.A. Read ,
S.M. Scarrott ,
C.J. Lonsdale  and
Q.A. Parker
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
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 38
Copyright
Copyright © Kluwer 1993 

References

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Wolstencroft, R.D. et al. (1991) In ‘Digitised Optical Sky Surveys’, Kluwer, Dordrecht, pp 471–483.Google Scholar