Other
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.3663l&link_type=abstract
HST Proposal ID #3663
Other
Hst Proposal Id #3663
Scientific paper
We propose to obtain high-resolution (R=1000) spectropolarimetry of the Luminous Blue Variable AG Carinae with the FOS. AG Car undergoes quasi- periodic outbursts on a time-scale of about 15 years. The on-set of such an outburst has recently been detected. During the outburst, the stellar mass-loss rate increases by a factor of 100, leading to the ejection of discrete shells. The relicts of previous (10e4 yr ago) mass ejections are visible as a bipolar jet and other nebulous filaments within 30" around AG Car. It is intended to measure the linear polarization of strong ultraviolet resonance lines originating in the wind of AG Car, such as Fe II (1) and Mg II (1) in the wavelength region 2300A - 3100A. Such SCATTERING lines are the most sensitive probe to study asymmetries in the wind by spectropolarimetric techniques. The scientific goal is to search for evidence for asymmetry in the stellar wind of AG Car within 10 stellar radii and to correlate the derived geometry with the morphology of the bipolar, spatially resolved structures at a distance of 0.1 pc from the star. The results will be interpreted in terms of the outburst mechanism of AG Car, and of Luminous Blue Variables in general. We request a total of 2 sets of observations, separated in time by the flow-time scale of AG Car (4 months), in order to study the temporal evolution of the flow geometry.
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