Survey of SMC Planetary Nebulae: Nebular and Stellar Evolution in a Low- Metallicity Environment

Details Survey of SMC Planetary Nebulae: Nebular and Stellar Evolution in a Low- Metallicity Environment Survey of SMC Planetary Nebulae: Nebular and Stellar Evolution in a Low- Metallicity Environment

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8663s&link_type=abstract

HST Proposal ID #8663

Physics

Hst Proposal Id #8663 Ism And Circumstellar Matter

Scientific paper

A survey of SMC planetary nebulae {PNe} is proposed to study the co-evolution of the nebulae and their central stars, in an environment that is chemically very metal poor. We will obtain STIS imaging and medium-resolution slitless 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 prior AGB phase. These relationships between PN and central star evolution will be pursued in the SMC with a sample free of distance uncertainties and selection biases, and in a metal-poor chemical environment that stands in sharp contrast to the Galaxy and the LMC. The importance of this program is two- fold: We will determine the late evolutionary paths of the most common stars in a galaxy that, in its chemical content, mimics a young galaxy; and we will produce a sample of extragalactic PN images and spectra that will far exceed in number the galactic PNe already observed with HST, providing an homogeneous database for testing the evolutionary implications of metallicity variations in stellar evolution.

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