Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9092h&link_type=abstract
HST Proposal ID #9092
Computer Science
Hst Proposal Id #9092 Ism And Circumstellar Matter
Scientific paper
Post-AGB stars can undergo a final episode of helium shell burning after the star has ejected a planetary nebula and has started on the white dwarf track. Starting in 1996 Sakurai's star has been observed to undergo a final helium shell flash. The same series of events occurred in V605 Aql 91 years ago. These stars both ejected a shell of gas first seen as a pseudo-photosphere and then as a thick dust envelope. The shells are expanding at about 100 km s-1 and in the case of V605 Aql the shell now appears about 1" across. We propose to image this shell with WFPC2. The shell contains ionized material as well as dust. By combining WFPC2 and Gemini high spatial resolution infrared images we will discriminate between bipolar and lumpy models of the circumstellar shell. Since the precursor to the final flash was a white dwarf, as opposed to an AGB star with a complex structure and complex circumstellar environment, the observations will provide a test of the origins of structure in circumstellar shells and planetary nebulae. Comparison with a decade old FOC image may yield the luminosity of V605 Aql.
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