Physics – Atomic Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6041d&link_type=abstract
HST Proposal ID #6041
Physics
Atomic Physics
Hst Proposal Id #6041 Hot Stars
Scientific paper
Observations of Eta Carinae affect several differenttheoretical topics. This star is valuable for the physics ofgiant LBV eruptions, the most extreme instability that anystar has been known to survive; and the LBV phenomenon isimportant for the evolution of the most massive stars. Almostindependently, the ejecta of Eta Car now form one of the verybest cases for modeling both the large- and small-scaledynamics of astrophysical bipolar structures. Anothertheoretical connection involves atomic physics, particularlyemission-line spectroscopy; the rich Fe II spectra of thisstar and its ejecta make it the best example for some recentlydiscovered fluorescent excitation mechanisms. HSTobservations of Eta Car have been immensely helpful in all ofthese connections; dramatic WFPC2 images have made its large-scale bipolar structure famous, while other studies haverevealed the central stellar spectrum and the current mass-loss rate, strange ejected blobs near the star, and small-scale instabilities in the bipolar ejecta. The previous HSTwork has revealed new questions that need new HST data, whilethere are also some previously recognized gaps in the data.Here we propose specifically appropriate studies with the HRS,FOS, and WFPC2, aimed at both the star itself and its ejectawith a wide range of size scales as well as a wide range oftheoretical applications.
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