A study of H2 emission in the bipolar proto-planetary nebula IRAS 17150-3224

Bruce J. Hrivnak, Douglas M. Kelly, Kate Y.L. Su, Sun Kwok, Raghvendra Sahai

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7 Scopus citations


H2 emission has been detected in the bipolar proto-planetaiy nebula IRAS 17150 - 3224 from the 1 -0 S(1), 1-0 S(0), and 2-1 S(1) transitions in the 2 μm region. Line ratios suggest that this emission is due to collisional excitation. High-resolution imaging with NICMOS on HSTshows that the emission comes from four regions: clumps near the ends of the lobes (the brightest region), the lobes in general, a particular region outside the northwest lobe, and a faint loop in the equatorial region. Spatially resolved high-resolution spectra at 2.12 μm reveal that the H2 1-0 S(1) line has a velocity width of about 35 km s-1 in the lobes, consistent with C-type shocks. The emission from the clumps in the lobes appears to arise from the impact of a fast wind with the slower moving material in the AGB wind.

Original languageEnglish (US)
Pages (from-to)237-245
Number of pages9
JournalAstrophysical Journal
Issue number1 I
StatePublished - Oct 10 2006


  • Circumstellar matter
  • Infrared: stars
  • Planetary nebulae: general stars: AGB and post-AGB
  • Stars: mass loss

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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