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Title: Birth and early evolution of a planetary nebula
Authors: Bobrowsky, M
Sahu, K. C
Parthasarathy, M
García-Lario, P
Keywords: Star;Planetary Nebula;White Dwarf;Stellar Evolution;Spherical Star;Asymmetric Nebula;Stingray Nebula;Nebular Structure
Issue Date: Apr-1998
Publisher: Nature Publishing Group
Citation: Nature, Vol. 392, No. 6675, pp. 469 - 471
Abstract: The final expulsion of gas by a star as it forms a planetary nebula - the ionized shell of gas often observed surrounding a young white dwarf - is one of the most poorly understood stages of stellar evolution,. Such nebulae form extremely rapidly (about 100 years for the ionization) and so the formation process is inherently difficult to observe. Particularly puzzling is how a spherical star can produce a highly asymmetric nebula with collimated outflows. Here we report optical observations of the Stingray nebula,, which has become an ionized planetary nebula within the past few decades. We find that the collimated outflows are already evident, and we have identified the nebular structure that focuses the outflows. We have also found a companion star, reinforcing previous suspicions that binary companions play an important role in shaping planetary nebulae and changing the direction of successive outflows.
Description: Restricted Access
ISSN: 0028-0836
Appears in Collections:IIAP Publications

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