Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5851d&link_type=abstract
HST Proposal ID #5851
Computer Science
Hst Proposal Id #5851 Interstellar Medium
Scientific paper
This proposal represents the continuation of our systematic and definitive study, using HST observations, of a large sample of PNs at known distance in the Magellanic Clouds. Direct PC and FOC imaging has already been obtained for all of our proposed Cycle 5 sample in previous-cycle GTO programs. These images give the spatial structures, sizes, ionised masses, and dynamical ages of the PNs. However, no UV spectroscopy exists for these objects. As in previous cycles of our GO program, we are requesting FOS spectrophotometry in the range 1150--4800 Angstrom. By using this data in combination with the PC images and ground-based data, and with stellar atmospheric and evolutionary models, we will derive the effective temperature, luminosity, and core mass for the PN central stars, and determine the nebular abundances of all elements involved in dredge-up processes. The program objects cover an important high luminosity and excitation region of the HR diagram, and complement the coverage of our previously- observed sample. With this new sample we will achieve complete coverage of post-AGB evolutionary parameter space. Large gains in observing efficiency are obtained by executing the program during CVZ periods.
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