Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..125..355h&link_type=abstract
A & A Supplement series, Vol. 125, October II 1997, 355-366.
Astronomy and Astrophysics
Astronomy
7
Planetary Nebulae
Scientific paper
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 larger than 1 M_{\odot}, suggesting that much of the mass ejected by the PN precursor is contained in faint outer extensions. This might contribute to the solution of the ``mass deficit" in PNe. We have also provided calibrated fluxes for some specific emission lines. In spite of their apparent morphological differences, our observations suggest that these type I PNe possess the same intrinsic structure as that displayed by NGC 650-1, the Ring Nebula, and even Sh 1-89 with its elongated jet-like feature, but viewed under different angles. Deep morphologies of type I planetary nebulae\thanks{ The observations we re carried out at the Observatoire de Haute Provence, St Michel l'Observatoire - France. (*) NGC 6302 was observed at Mt John University Observatory - Lake Tekapo - operated by the University of Canterbury, Christchurch, New-Zealand.
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