Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6042d&link_type=abstract
HST Proposal ID #6042
Physics
Hst Proposal Id #6042 Hot Stars
Scientific paper
We propose to study the physical nature and processes in the gas ejected by the massive star Eta Carinae during its ``Great Eruption" of 1837-1860 and later. Imagery of Eta Car by HST during the past few years has revealed details of a complex ``double-bubble" geometry of ejection, with numerous very high velocity jets and flows between the bipolar lobes of the main mass ejection, previously called the Homunculus. Now we propose to follow the exciting imagery results with spectroscopy of some of the physically distinct features of the ejecta using the Faint Object Spectrograph to obtain UV- optical spectra covering the full 1150-8500Angstrom wavelength range. Coupled with previous HST imagery and ground-based observations, these new data will enable us to perform detailed analysis of the gas kinematics, physical conditions, and abundances at various locations in the ejected material. Eta Carinae is the best example of an ``astrophysical geyser" from a massive star caught in a state of active eruption prior to becoming a supernova. The proposed spectroscopic studies with HST should provide fundamental information for understanding the physics of this phenomenon.
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