Establishing The Nature Of A Mysterious Evolved Star, HD179821

Details Establishing The Nature Of A Mysterious Evolved Star, HD179821 Establishing The Nature Of A Mysterious Evolved Star, HD179821

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21349119f&link_type=abstract

American Astronomical Society, AAS Meeting #213, #491.19; Bulletin of the American Astronomical Society, Vol. 41, p.470

Astronomy and Astrophysics

Astronomy

Scientific paper

The nature of an evolved star, HD179821, has been debated over years. The major problem is that this enigmatic object possesses characteristics of both a post-AGB star and a yellow hyper-giant, and there is no evidence that unambiguously defines its nature. We have obtained the second-epoch HST/WFPC2 data of its circumstellar shell, which shows multiple concentric arcs extending out to about 8 arcsec. Together with the archived first-epoch data, we have performed proper-motion measurements of the shell structures in order to determine the distance to the object, in hopes of resolving the nature of this object.

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