Mathematics – Logic
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6039b&link_type=abstract
HST Proposal ID #6039
Mathematics
Logic
Hst Proposal Id #6039 Interstellar Medium
Scientific paper
He 3-1357 has apparently become a planetary nebula only within the last 40 years. IUE and ground-based observations have revealed that its spectrum changes noticeably over just a few years, showing stellar evolution ``caught in the act''. HST images resolved it for the first time {in Cycle 2} and we are now in a position to study both its spectral and morphological evolution. It is of crucial importance to determine whether the unique spectral changes observed in He 3-1357 are related to a sporadic episode of mass loss enhancement, or whether they constitute the evidence for continuous temporal evolution through the H-R diagram. We propose a combination of imaging and spectral observations, not only to derive the physical conditions and chemical abundances in the nebula, but also to investigate the stellar wind {which is known to be changing in time as well} and understand the characteristics of the central star. The extremely compact nature of He 3-1357 makes necessary the use of the high-resolution capabilities of HST to determine how the chemical abundances vary throughout the nebula. These results will be important not only for understanding this rapidly-changing object, but also for understanding the formation process of planetary nebulae in general and for testing the models trying to explain the early evolution of planetary nebulae.
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