The nature of the nebulae A21 /YM 29/ and Simeiz 22

Details The nature of the nebulae A21 /YM 29/ and Simeiz 22 The nature of the nebulae A21 /YM 29/ and Simeiz 22

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pazh....4...16a&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 4, Jan. 1978, p. 16-20.) Soviet Astronomy Letters, vol. 4, Jan.-Feb. 1978, p. 7-10. Tra

Astronomy and Astrophysics

Astronomy

2

Astronomical Models, Emission Spectra, Nebulae, Radio Astronomy, Line Spectra, Planetary Nebulae, Size Determination, Stellar Winds

Scientific paper

Previous optical and radio observations of the nebulae A21 (YM 29, the Medusa) and Simeiz 22 are reviewed, emphasizing their fine filamentary structure, high envelope expansion velocities, and peculiar emission-line spectra. The data discussed indicate that the two nebulae are very similar in terms of morphology, optical spectrum, and kinematics, and that the presence of a shock wave, most likely produced by a stellar wind, is required to explain their anomalous physical properties. These nebuale are shown not to be supernova remnants, old planetary nebulae, or shell nebulae around massive hot stars. It is suggested that the model of a planetary nebula with a stellar wind can account for the unusual physical characteristics of these two objects.

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