A stronger He II 4686 in the spectrum of the planetary nebula NGC 6572

Details A stronger He II 4686 in the spectrum of the planetary nebula NGC 6572 A stronger He II 4686 in the spectrum of the planetary nebula NGC 6572

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...207l...5m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 207, no. 1, Dec. 1988, p. L5 to L7. Research supported by the Instituto de Ast

Astronomy and Astrophysics

Astrophysics

9

Astronomical Spectroscopy, Helium, Planetary Nebulae, Stellar Spectra, Spectral Resolution, Temporal Distribution, Variable Stars

Scientific paper

On a recent spectrogram of the planetary nebula NGC 6572 the authors have found He II 4686 clearly in emission. They review previous descriptions of the spectrum and conclude that He II 4686 is stronger than 20 years ago. They briefly discuss the possible implications of this result, and suggest a careful monitoring of several planetary nebulae.

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