Snapshot Survey for Planetary Nebulae in Local Group Globular Clusters

Details Snapshot Survey for Planetary Nebulae in Local Group Globular Clusters Snapshot Survey for Planetary Nebulae in Local Group Globular Clusters

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11714b&link_type=abstract

HST Proposal ID #11714. Cycle 17

Physics

Scientific paper

Planetary nebulae {PNe} in globular clusters {GCs} raise a number of interesting issues related to stellar and galactic evolution. The number of PNe known in Milky Way GCs, four, is surprisingly low if one assumes that all stars pass through a PN stage. However, it is likely that the remnants of stars now evolving in Galactic GCs leave the AGB so slowly that any ejected nebula dissipates long before the star becomes hot enough to ionize it. Thus there should not be ANY PNe in Milky Way GCs-but there are four! It has been suggested that these PNe are the result of mergers of binary stars within GCs, i.e., that they are descendants of blue stragglers. The frequency of occurrence of PNe in external galaxies poses more questions, because it shows a range of almost an order of magnitude. I propose a Snapshot survey aimed at discovering PNe in the GC systems of Local Group galaxies outside the Milky Way. These clusters, some of which may be much younger than their counterparts in our Galaxy, might contain many more PNe than those of our own galaxy. I will use the standard technique of emission-line and continuum imaging, which easily discloses PNe. This proposal continues a WFPC2 program started in Cycle 16, but with the much more powerful repaired ACS. As a byproduct, the survey will also produce color-magnitude diagrams for numerous clusters for the first time, reaching down to the horizontal branch.;

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