The survey discovered 30 new hydrogen-deficient planetary-nebula central stars, raising the known PG1159 count from 25 to 46 and identifying the first DOZ white dwarfs associated with planetary nebulae.
M., Miller Bertolami, M
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Spectroscopic survey of faint planetary-nebula nuclei. VII. Thirty new hydrogen-deficient central stars
The survey discovered 30 new hydrogen-deficient planetary-nebula central stars, raising the known PG1159 count from 25 to 46 and identifying the first DOZ white dwarfs associated with planetary nebulae.