Other
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9721d&link_type=abstract
HST Proposal ID #9721
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Hst Proposal Id #9721 Ism And Circumstellar Matter
Scientific paper
We propose a series of observations using ACS/HRC that will perform astrometric measurements of the ejecta around eta Car. We will observe ejecta in three distinct regions: the inner {characterized by the close-in debris such as the Weigelt blobs}, the intermediate {primarily the equatorial disk}, and the outer {the homunculus and the North and South Jet structures}. These observations will provide second and third epoch measurements vs. previous WFPC2 data. The resultant significantly increased temporal baseline {with corresponding decreases in proper motion, date of origin and 3D orientation errors} will allow for the detection of acceleration and non-radial motion in the ejecta, testing the canonical hypothesis of ballistic motion. A secondary goal of the observations will be to compare the HRC measurements with concurrent Cycle 12 WFPC2 measurements taken by other observers {who have indicated they will release their data immediately} is order to provide a calibration link between the WFPC2 and HRC astrometric frames. Our proposed HRC observations will require three HST orbits.
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