Abstract
Evans, Catchpole and Jones1 recently suggested that the small southern planetary nebula, IC 4642, shows striking spectral changes. They compared eye estimates of intensity on low dispersion spectrograms with low-resolution scanner measurements published by Aller and Faulkner2.
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Evans, D. S., Catchpole, R. M., and Jones, D. H. P., Nature, 220, 249 (1968).
Aller, L. H., and Faulkner, D. J., IAU-URSI Symp. No. 20, 45 (1964).
Hayes, D., thesis, Univ. Calif., Los Angeles (1967).
Oke, J. B., Astrophys. J., 140, 691 (1964).
Aller, L. H., Faulkner, D. J., and Norton, R., Astrophys. J., 144, 1091 (1966).
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ALLER, L., WARES, G. Spectral Line Intensity Variations in Planetary Nebulae. Nature 221, 646 (1969). https://doi.org/10.1038/221646a0
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DOI: https://doi.org/10.1038/221646a0
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