SNAPSHOT survey of the Planetary Nebulae population of the Galactic Bulge

Details SNAPSHOT survey of the Planetary Nebulae population of the Galactic Bulge SNAPSHOT survey of the Planetary Nebulae population of the Galactic Bulge

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9356z&link_type=abstract

HST Proposal ID #9356

Computer Science

Hst Proposal Id #9356

Scientific paper

The spectacular structures seen in HST images of planetary nebulae {PNe} are generally accepted as originating from hydrodynamical interactions between stellar winds: the interacting-stellar wind model {ISW}. Traditionally, the shaping is thought to occur after the star becomes hot enough to ionize the PN. But recent HST images indicate that the shaping may occur earlier, and the newer GISW model puts the shaping during the pre-planetary nebula evolution. The relative importance of both models is not known: GISW shaping will account for some fraction of PNe, but estimates range from 15-100 during the PN phase, especially for the youngest PNe. We here propose an HST SNAPshot survey of compact PNe in the Galactic Bulge, to test these predictions. The Bulge provides the only PNe population for which progenitor masses are known and nebular ages can be measured. In support of these HST measurements we have already measured velocity fields and emission line fluxes. The survey will give an unbiassed sampling of morphologies, and allow evolutionary sequences to be determined to test the ISW versus the GISW model. By-products of the survey will be the determination of nebular masses, diameters and filling factors. We will also obtain the White Dwarf mass distribution in the Bulge, and the initial-final mass function for low-mass stars.

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