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Frosty Leo Nebula
The Frosty Leo Nebula is a protoplanetary nebula (PPN) located roughly at 10,000 light-years away from Earth in the direction of the constellation Leo. It is a spectral bipolar nebula. Its central star is of optical spectral type K7II,〔 by itself called ''Frosty Leo''.〔(K-band image of the peculiar star Frosty Leo ), in image gallery of ESO〕 It is unusual in that it has an extremely deep absorption feature at 3.1 µm and is unusually located at more than 900 pc above the plane of our galaxy. Further, as of 1990, it has the only known PPN circumstellar outflow in which crystalline ice dominates the long-wavelength emission spectrum and the only known PPN with point-reflection-symmetric deviations from axial symmetry.〔
==Characteristics==
The Frosty Leo Nebula has two lobes that are separated by 2″ between which is an almost edge-on dust ring.〔 It also has two relatively faint but prominent compact nebulosities, or ''ansae'', separated by ~23″ along the polar axis of the PPN.〔 The PPN as a whole has an hourglass like shape. It has an inclination angle of 15° relative to the plane of the sky.〔 Its molecular envelope is expanding at a rate of ~25 km/s.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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