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Search: authors:"C. T. Hua"

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Deep morphologies of type I planetary nebulae

Deep narrow band interference filters observations are presented for 7 type I galactic planetary nebulae (PNe). Except for the nearly circular planetary nebula A 39, the observations show overall dimensions appreciably larger than those quoted so far. The observed PN (NGC 6302 excepted) could have linear diameters larger than 1 pc. Our new observations imply ionized masses often...

Deep morphologies of type I planetary nebulae

Deep narrow band interference filters observations are presented for 7 type I galactic planetary nebulae (PNe). Except for the nearly circular planetary nebula A 39, the observations show overall dimensions appreciably larger than those quoted so far. The observed PN (NGC 6302 excepted) could have linear diameters larger than 1 pc. Our new observations imply ionized masses often...

Deep morphologies of type I planetary nebulae

Deep narrow band interference filters observations are presented for 7 type I galactic planetary nebulae (PNe). Except for the nearly circular planetary nebula A 39, the observations show overall dimensions appreciably larger than those quoted so far. The observed PN (NGC 6302 excepted) could have linear diameters larger than 1 pc. Our new observations imply ionized masses often...

Detection of new emission structures around planetary nebulae

Deep monochromatic observations are presented for 22 galactic planetary nebulae (PNe) performed through narrow-band interference filters, in the direct imaging mode with i) the New Zealand (MJUO) f/7.8 Mc-Lellan telescope, ii) the Observatoire de Haute Provence (OHP) f/6 120-cm telescope, and iii) and the Siding Spring Observatory (SSO) ATT 2.3 metre telescope. Some of them are...