An Excited H_2 Disk and the Core Structure of the Extraordinary Bipolar Planetary Nebula KJPN 8

Details An Excited H_2 Disk and the Core Structure of the Extraordinary Bipolar Planetary Nebula KJPN 8 An Excited H_2 Disk and the Core Structure of the Extraordinary Bipolar Planetary Nebula KJPN 8

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.

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