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.
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Three new candidate ancient planetary nebulae, each several arcminutes across with extremely low [O iii] surface brightness around 30 mag arcsec^{-2}, were discovered using amateur telescopes, with candidate central stars yielding age estimates of 50-100 thousand years.
citing papers explorer
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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.
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Ancient 'ghost' planetary nebulae discovered with amateur telescopes
Three new candidate ancient planetary nebulae, each several arcminutes across with extremely low [O iii] surface brightness around 30 mag arcsec^{-2}, were discovered using amateur telescopes, with candidate central stars yielding age estimates of 50-100 thousand years.