Bipolar nebulae

Computer Science

Scientific paper

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Carbon Stars, Interstellar Gas, Late Stars, Nebulae, Stellar Evolution, Emission Spectra, Infrared Radiation, Interstellar Extinction, Minkowski Space, Optical Thickness, Polarized Light, Ubv Spectra

Scientific paper

The observed characteristics of the bipolar nebulae (BN) are examined with a view of exploring the development state of the objects. The so-called old BN, the Egg-Nebula and the CRL 618, are considered, and it is shown that they possess a compact, optically thick, expanding CO-shell, with the CO molecule having most probably originated in the atmosphere of a cool star rich in carbon. The Minkowski's footprint and the S106 BN are also considered. It is suggested that further studies of the development state of the BN may provide the key to understanding the initial and the last stages in the development of single stars.

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