Discovery of Multiple Coaxial Rings in the Bipolar Nebula Hb12

Details Discovery of Multiple Coaxial Rings in the Bipolar Nebula Hb12 Discovery of Multiple Coaxial Rings in the Bipolar Nebula Hb12

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915601k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #156.01; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

A series of two-dimensional rings along a common axis aligned with the bipolar lobes is found in the planetary nebula Hb 12. The rings have separations of about 0.5 arc sec, which can be translated into physical separations of 1700 AU, or time separations of the order of 100 years. We suggest that the existence of the rings is a manifestation of the interaction between a time-variable, collimated fast outflow with the circumstellar envelope created by the stellar wind of an asymptotic giant branch star.

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