Computer Science
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2338d&link_type=abstract
HST Proposal ID #2338
Computer Science
Hst Proposal Id #2338
Scientific paper
Eta carinae is thought to be the most extreme known Luminous Blue Variable (LBV), marking the unstable upper boundary of the HR Diagram. It is crucial for theories of the LBV outburst phenomenon, only recently beginning to be developed. Recently the "central object" in Eta Carinae has been found by speckle techniques to be multiple. Combined with the presence of circumstellar emission and scattering, this multiplicity means that high spatial resolution is needed in order to obtain spectral data specifically on the primary component, the very massive LBV star. The fainter components are also important -- if they are stars, then this is a unique chance to study a truly coeval system of very massive stars of known age (known because the LBV is present), and if they are nebular objects, then we need spectra in order to understand why they are so unexpectedly bright. For these reasons we propose to us the FOS to obtain spectra of the primary star and of its companion objects. The stellar spectra will be used for a quantitative analysis by NLTE methods, aiming for estimates of Teff, g, chemical composition, mass, mass-loss rate, wind velocity field, and luminosity.
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