All of the sources consist of a bright core and an extended nebula. Górny (eds.), Post-AGB as a Phase of Stellar Evolution: Proceedings of the Toruń Workshop held July 5–7, 2000, Kluwer Academic Publishers (2001), →ISBN, page 352,įigure 1 shows obtained images of the Red Rectangle. Miyata et al, “Spatially Resolved Spectra of the Red Rectangle in the N-band”, in Ryszard Szczerba and Sławomir K. The Red Rectangle is a bipolar nebula with a remarkable spectrum in which emission is excited by the light of the central star HD44179. Notice that nothing was done, although History says 'Draw Rectangle / Finish Rectangle'. Tielens and Theodore Peck Snow (eds.), The Diffuse Interstellar Bands, Springer, →ISBN, page 143, See the circles to resize, but no actual rectangle. the little squares in each corner mean 'right angle' Each internal angle is 90° Opposite sides are parallel and of equal length (so it is a Parallelogram ). Scarrott, “Red Rectangle Emission Bands”, in Alexander G.G.M. A rectangle is a four-sided flat shape where every angle is a right angle (90°). The Red Rectangle is only one example of an infrared object that is detectable in the infrared because of grain emission. Dalgarno and David Layzer (eds.), Spectroscopy of astrophysical plasmas, Cambridge University Press, →ISBN, page 12, Lynds, “Optical observations of nebulae”, in A.
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