The optical form of the bipolar preplanetary nebula IRAS 09371 + 1212

Details The optical form of the bipolar preplanetary nebula IRAS 09371 + 1212 The optical form of the bipolar preplanetary nebula IRAS 09371 + 1212

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102..446m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, April 1990, p. 446-453.

Astronomy and Astrophysics

Astronomy

33

Planetary Nebulae, Stellar Evolution, Brightness Distribution, Charge Coupled Devices, Emission Spectra, Infrared Astronomy Satellite, Reflection Nebulae, Stellar Envelopes

Scientific paper

CCD images of IRAS 09371 + 1212 were taken during two different observing runs at the 1.5-m telescope at La Silla, Chile. The characteristics of the bipolar Frosty Leo Nebula indicate that it is a transitional object belonging to the relatively small class of preplanetary nebulae. It is unique among known objects in two respects: it has the only circumstellar outflow in which crystalline ice dominates the long-wavelength emission spectrum, and it is unique among preplanetary nebulae in having point-reflection-symmetric deviations from axial symmetry. The interpretation offered for this symmetry is that the bipolar outflow is directed by a precessing disk.

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