Other
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..610b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 15, 1984, p. 610-614. Research supported by the Alfred P. Sloan
Other
38
Abundance, Astronomical Photometry, Cosmochemistry, Halos, Planetary Nebulae, Spectrophotometry, Electron Density (Concentration), Electron Energy, Line Spectra, Radial Velocity
Scientific paper
The position of the planetary nebula 61 + 41 deg 1 (DDM 1) was measured relative to several SAO catalog stars. Evidence was found that supports the theory that 61 + 41 deg 1 is a halo object. The spectrophotometry of emission-line intensities, made over 3700-11,000 A, and the chemical abundances compared to other objects were examined. Oxygen, neon, sulfur, and argon abundances were all approximately one-sixth solar, in contrast to other known halo planetaries. Since these chemical deficiencies in 61 + 41 deg 1 resemble one another, it is suggested that oxygen and neon levels have not been enhanced by nuclear reactions in the planetary progenitor, although substantial mixing of processed material into the planetary envelope has occurred.
Barker Terrance
Cudworth Kyle McC.
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