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) The nebula and binary star w:HD 44179, HD 44179.
Beverly T. Lynds, "Optical observations of nebulae", in A. Dalgarno and David Layzer (eds.),
Spectroscopy of astrophysical plasmas
> Cambridge University Press, ISBN 0-521-26927-X, page 12,
: The is only one example of an infrared object that is detectable in the infrared because of grain emission.
J.R. Miles, P.J. Sarre, and S.M. Scarrott, "Red Rectangle Emission Bands", in Alexander G.G.M. Tielens and Theodore Peck Snow (eds.),
The Diffuse Interstellar Bands
> Springer, ISBN 0792336291, page 143,
: The is a bipolar nebula with a remarkable spectrum in which emission is excited by the light of the central star HD44179.
July, T. Miyata et al, "Spatially Resolved Spectra of the in the N-band", in Ryszard Szczerba and SÅ‚awomir K. Górny (eds.),
Post-AGB as a Phase of Stellar Evolution: Proceedings of the ToruÅ„ Workshop held July 5"7, 2000
> Kluwer Academic Publishers (2001), ISBN 0-7923-7145-3, page 352,
: Figure 1 shows obtained images of the . All of the sources consist of a bright core and an extended nebula.
Coined by astronomers Martin Cohen and Mike Merrill in 1973
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