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The expansion and possible structure of the planetary nebula NCG 2440
Publications of the Astronomical Society of the Pacific1974Vol. 86, pp. 635–635
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Abstract
We have measured radial velocities along the major axis of NGC 2440, which show that the outer knots do not lie on a line with the inner condensations. The observations suggest that the bright inner nebula is expanding faster than the faint outer halo, and that these two parts of the nebula were produced independently of one another. The nebula shows an extreme degree of stratification. Key words: planetary nebulae
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