H sub(2) Imaging of Three Proto-Planetary and Young Planetary Nebulae

High-resolution (0".15) 2.12 mu m H sub(2) and narrowband K images have been obtained of one cool proto-planetary nebula, IRAS 20028+3910, and two hot proto-planetary/young planetary nebulae, IRAS 19306+1407 and IRAS 22023+5249. The observations were made with an adaptive optics system and near...

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Bibliographic Details
Published in:The Astrophysical journal 2004-12, Vol.616 (2), p.1181-1187
Main Authors: Volk, K, Hrivnak, B J, Kwok, S
Format: Article
Language:English
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Summary:High-resolution (0".15) 2.12 mu m H sub(2) and narrowband K images have been obtained of one cool proto-planetary nebula, IRAS 20028+3910, and two hot proto-planetary/young planetary nebulae, IRAS 19306+1407 and IRAS 22023+5249. The observations were made with an adaptive optics system and near-infrared imager on the Gemini North 8 m telescope. All three nebulae are seen to be extended, and in two and possibly all three of them H sub(2) is found to be emitting from bipolar lobes. In IRAS 19306+1407, H sub(2) emission is seen arising from a ring close to the star and from the edges of emerging bipolar lobes. In IRAS 20028+3910, one bright lobe and a very faint second lobe are seen in the H sub(2) and K-band images, similar to the published visible images, but in the H sub(2) and K-band images a faint filament appears to connect the two lobes. The central star is not seen in IRAS 20028+3910, indicating that the nebula is optically thick even at 2 mu m, which is unusual. The images suggest that extended H sub(2) emission is often the manifestation of fast-slow wind interactions in the bipolar lobes.
ISSN:0004-637X