Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9077s&link_type=abstract
HST Proposal ID #9077
Computer Science
Hst Proposal Id #9077 Ism And Circumstellar Matter
Scientific paper
A SNAPSHOT survey of all known LMC planetary nebulae {PNe} is proposed to study the co-evolution of the nebulae and their central stars, and to probe the chemical enrichment history of the LMC. We will obtain STIS imaging and medium-resolution slit-less spectroscopy which will yield line fluxes and nebular morphologies in important emission lines, plus magnitudes of the central stars. From these data we will gather a harvest of information: the nebular size, morphology, ionization structure, density, and mass; and the central star temperature, luminosity, and mass. We will test the correlation found in the Galaxy of nebular bipolarity with large progenitor star mass and with chemical enrichment of the outer envelope during the AGB phase. These relationships between PN and central star evolution will be pursued in the LMC with a sample free of distance uncertainties and selection biases. The importance of this program is two-fold: We will determine the late evolutionary paths of the most common stars in a local group galaxy that, in its chemical content, stands in sharp contrast to the SMC, where a complimentary survey is already underway; and we will produce a flux-limited sample of extra-galactic PNe images and spectra that will far exceed in number the galactic PNe already observed with HST, providing an homogeneous database for testing stellar evolution and the chemical history of the LMC.
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