The population of compact planetary nebulae in the Galactic Disk

Details The population of compact planetary nebulae in the Galactic Disk The population of compact planetary nebulae in the Galactic Disk

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11657s&link_type=abstract

HST Proposal ID #11657. Cycle 17

Computer Science

Scientific paper

We propose to secure narrow- and broad-band images of compact planetary nebulae {PNe} in the Galactic Disk to study the missing link of the early phases of post-AGB evolution. Ejected AGB envelopes become PNe when the gas is ionized. PNe expand, and, when large enough, can be studied in detail from the ground. In the interim, only the HST capabilities can resolve their size, morphology, and central stars. Our proposed observations will be the basis for a systematic study of the onset of morphology. Dust properties of the proposed targets will be available through approved Spitzer/IRS spectra, and so will the abundances of the alpha-elements. We will be able thus to explore the interconnection of morphology, dust grains, stellar evolution, and populations. The target selection is suitable to explore the nebular and stellar properties across the Galactic Disk, and to set constraints on the Galactic evolutionary models through the analysis of metallicity and population gradients.;

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