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The peculiar planetary nebula in M22
Cohen, J. G.; Gillett, F. C.
AA(Palomar Observatory, Pasadena, CA), AB(NASA, Astrophysics Div., Washington, DC)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 803-807. Research supported by California Institute of Technology. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Globular Clusters, Peculiar Stars, Planetary Nebulae, Red Giant Stars, Echelle Gratings, H Alpha Line, Infrared Astronomy Satellite, Iue, Spectral Energy Distribution, Stellar Luminosity
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The source discovered by the IRAS satellite near the center of the globular cluster M22, IRAS 18333-2357, has been studied using the IUE satellite and a ground-based optical telescope. The northern component of the close pair of stars is not a member of the cluster. The southern component is a hot star with T(eff) of about 50,000 K illuminating a small planetary nebula and is a member of M22. Both the planetary nebula and its central star are extremely hydrogen deficient. The luminosity of the central star is in good agreement with that expected on theoretical grounds and with the observed luminosity of the tip of the red giant branch.

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