Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...518..778l&link_type=abstract
The Astrophysical Journal, Volume 518, Issue 2, pp. 778-783.
Astronomy and Astrophysics
Astronomy
3
Ism: Structure, Planetary Nebulae: Individual (Kjpn 8), Radio Continuum: Ism, Techniques: Interferometric
Scientific paper
A disk of excited H_2v=1-->0 S(1) (2.122 μm) emission has been found in the core of the extraordinary bipolar planetary nebula KjPn 8. This surrounds the central, extended, and clumpy thermal radio emission (VLA) and near-infrared (J, H, and K' bands) source. The H_2 disk is found to be contained within a previously found expanding CO disk, and they share the same orientation. The plane of the H_2 disk is perpendicular to the high-velocity bipolar outflows. The 4" diameter core of KjPn 8 has also been observed for 37 on-source hours at a wavelength of 6 cm with the MERLIN radio interferometer with an angular resolution of 0.05". The data have been combined with 4 hr of VLA-A observations at the same wavelength but where the resolution is 0.5". The most remarkable feature of these radio observations is the possible presence of a weak ``point'' radio source embedded in the center of the H_2 disk. It is thought plausible that this point source may be direct emission from the powerful, ionized wind of the central star that now drives this nebulosity.
Kühn Oliver
Lopez Jose Alberto
Meaburn John
Muxlow Thomas W. B.
Pedlar Alan
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