STIS observations of Eta Carinae: Good spectral coverage at last

Details STIS observations of Eta Carinae: Good spectral coverage at last STIS observations of Eta Carinae: Good spectral coverage at last

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7302d&link_type=abstract

HST Proposal ID #7302

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Hst Proposal Id #7302 Stellar Ejecta

Scientific paper

Eta Carinae is uniquely significant for several astrophysical topics. The FOS and GHRS have produced excellent spectroscopic results on this object, solving some questions while opening some new ones. However, for instrumental reasons their spectral coverage of Eta Car has been inadequate. The STIS can eliminate this deficiency while also providing other advantages over the previous instruments. With the STIS we can estimate the different circumstellar extinctions of the central star and of ejecta within 0.3", while also obtaining diagnostic information from emission line profiles, line ratios, and continuum fluxes -- tasks that weren't feasible for this object with the FOS and HRS. These data will for the first time allow realistic modeling of the non-spherical wind and of densities and temperatures in the strange slow-moving equatorial condensations. Peculiar fluorescent excitation processes, which have produced some mysteries in the ejecta of Eta Car, can also be studied. Moreover, the same data will give improved information about the large-scale bipolar ejection nebula. The questions and characteristics of Eta Car need and deserve wide spectral coverage, good spectral resolution, and high spatial resolution all together; very few other astronomical objects rival it in this respect.

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