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Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6407d&link_type=abstract
HST Proposal ID #6407
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Hst Proposal Id #6407 Interstellar Medium
Scientific paper
This proposal represents the culmination of our systematic anddefinitive study, using HST observations, of a large sample ofPNs at known distance in the Magellanic Clouds. Over the pastfive cycles, images have been obtained for a total of 30objects (GO+GTO) and UV spectroscopy will finally be obtainedfor some 24 PN. The images give the spatial structures,sizes, ionised masses, and dynamical ages of the PNs. Inconjunction with FOS spectrophotometry in the range 1150--4800 Angstrom and our ground-based data, we have shown that wecan further derive the effective temperature, luminosity, andcore mass for the PN central stars, and also determine thenebular abundances of all elements involved in dredge-upprocesses. For no other sample of PN can we achieve such adetailed understanding of the evolution of both the PN centralstar and of its nebular shell; we have even been able toseparate the H-burning from He-burning PN, and have foundclear evidence of mass-dependent dredge-up. In Cycle 6 wepropose to complete this ambitious program by observing afurther 15 objects chosen to complement our previously-observed sample, and ensure complete coverage of the H-Rdiagram. Large gains in observing efficiency are obtained byexecuting the program during CVZ periods.
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