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PN g135.9+55.9：a new, extremely oxygen-poor planetary nebula in the galactic halo
oxygen-poor planetary nebula galactic halo
2009/6/11
PN g135.9+55.9：a new, extremely oxygen-poor planetary nebula in the galactic halo。
Chemical composition of globular cluster and halo post-agb stars
Chemical composition globular cluster halo post-agb stars
2009/6/11
Chemical composition of globular cluster and halo post-agb stars。
Detection of a giant halo around NGC 7027。