Tracking the Homunculus and Outer Ejecta of Eta Carinae

Details Tracking the Homunculus and Outer Ejecta of Eta Carinae Tracking the Homunculus and Outer Ejecta of Eta Carinae

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9775m&link_type=abstract

HST Proposal ID #9775

Computer Science

Hst Proposal Id #9775 Ism And Circumstellar Matter

Scientific paper

We request WFPC2 images of Eta Carinae in order to complete our WFPC2 database to track the expansion of high-velocity material ejected during one or more giant outbursts of the central supermassive star. These images will increase the time baseline to 8 years of high-resolution Planetary Camera data for measuring proper motions and monitoring photometric changes in the debris field. Assuming a distance to Eta of 2300 pc, we will be able to trace transverse motions of the debris to better than 15 km/s precision and should be able to discern deviations from linear motions that are predicted in some models for the Giant Eruption. PC1 images in red and blue continuum filters will be used to track the expansion of the dusty bipolar lobes of Eta's ''Homunculus'' and equatorial skirt of ejecta. WF3 emission-line images will be used to trace motions of the outer debris field 10'' - 40'' from the central star. We can uniquely address issues of hydrodynamic expansion and wind-wind interactions through a time series of exposures of this textbook bipolar system. Because many groups around the world who are working on different facets of Eta Carinae will be interested in these images, we waive the proprietary rights to the dataset in order to maximize its usage. The science goals and exposures requested here are NOT covered in the Cycle 11 Treasury program to monitor the Eta Carinae ''event'' in May 2003.

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