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IRAS 19475+3119 : ウィキペディア英語版 | IRAS 19475+3119
IRAS 19475+3119 is a protoplanetary nebula in the constellation of Cygnus, 15,000 light-years away. An observation with the Hubble Space Telescope revealed a quadrupolar structure.〔 The central star was originally 2.5 solar masses,〔Raghvendra Sahai et al.: ''A Quadrupolar Preplanetary Nebula: IRAS 19475+3119'', The Astrophysical Journal, Volume 658, Issue 1, pp. 410-422.〕 and is now 0.63 solar masses. The object is 8,300 times the luminosity of the sun and 4.9 kpc from the sun; its diameter is estimated to be 58 times that of the sun〔Ming-Chien Hsu, Chin-Fei Lee: (''An Envelope Disrupted by a Quadrupolar Outflow in the Pre-Planetary Nebula IRAS19475+3119'' ), arXiv:1105.2410v1〕 == References ==
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