Results 141 to 150 of about 6,433 (179)

A Physical Analysis of Wolf-Rayet Spectra. [PDF]

Proc Natl Acad Sci U S A, 1933
Payne CH.
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Galactic and Extragalactic Studies: III. Photographs of Thirty Southern Nebulae and Clusters. [PDF]

Proc Natl Acad Sci U S A, 1940
Shapley H, Paraskevopoulos JS.
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Spectrographic Observations of Relative Motions in the Planetary Nebulae. [PDF]

Proc Natl Acad Sci U S A, 1916
Campbell WW, Moore JH.
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Temperatures of the nuclei of three planetary nebulae.

The Astronomical Journal, 1950
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Misclassified and misidentified planetary nebulae and nuclei

Publications of the Astronomical Society of the Pacific, 1983
Observations are reported for 17 objects that are listed in the Catalogue of Galactic Planetary Nebulae (CGPN). These have either been misclassified as planetary nebulae, have been identified incorrectly by their observers or in the CGPN, or have had peculiar central stars erroneously assigned to them.
J. H. Lutz, J. B. Kaler
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The Nuclei of Planetary Nebulae

Publications of the Astronomical Society of Australia, 1967
For some years now, there have been suggestions that the nuclei of planetary nebulae are stars undergoing a final gravitational contraction to the white dwarf state. These have culminated in two important studies by O’Dell, and by Seaton and his collaborators, the results of which are indicated on the Hertzsprung-Russell diagram of Figure 1.
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Mass Loss from Nuclei of Planetary Nebulae

1987
Using high resolution ultraviolet spectra taken with the IUE satellite, we study the mass loss process from the nuclei of planetary nebulae (PNN). The measured wind velocities and mass loss rates are combined with other parameters of the nuclei and the surrounding nebulae (e.g.
L. Bianchi, M. Grewing
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Planetary Nebulae Nuclei with White Dwarf Spectra

1991
We report here on the first results of an ongoing spectroscopic investigation of very old planetary nebulae together with their central stars, with the aim of a better understanding of the late planetary and early white dwarf evolution. We found that most of our observed planetaries have hot degenerates as their central stars, two of them being twins ...
R. Napiwotzki, D. Schönberner
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