Planetary Nebulae & Their Central Stars in the Magellanic Clouds

Details Planetary Nebulae & Their Central Stars in the Magellanic Clouds Planetary Nebulae & Their Central Stars in the Magellanic Clouds

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1854m&link_type=abstract

IUE Proposal ID #NPGSM

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Scientific paper

We will investigate LMC and SMC planetaries, to determine chemical abundances, especially for carbon, and to determine the central star luminosities and temperatures. Both objectives will provide significant information to confront theories of the evolution of planetary nebula precursor stars. The proposed targets include both Nrich and C-rich planetaries. In previous IUE programs, we observed and analyzed seven planetaries in the Clouds; a comparable number of other Cloud planetaries has been observed by a group in the UK. Recent experience (our IUE 6th Year results) suggests that a substantial sample of the planetaries in the Clouds, with differing ionization conditions, chemical compositions, and central star luminosities from those already observed are within reach of IUE, and such observations are here proposed. Combining the earlier results with the proposed work, it should be possible to characterize the properties of a significant number of planetaries and their central stars, all of known distances. In particular, the central stars can be plotted in the HR diagram, and their masses estimated from theory as done in our previous work. Thus, the usual assumptions in statistical studies. that optically thin planetaries have equal mass and that optically thick planetaries have equal luminosity in a standard line, can be avoided. Supporting visible-light spectral data are available for all of the proposed targets.

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