Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7854s&link_type=abstract
HST Proposal ID #7854
Computer Science
Hst Proposal Id #7854 Interstellar And Intergalactic Media
Scientific paper
The high-resolution imaging and multicolor polarimetric capabilities of NICMOS comprise a superb combination for studying the processes by which evolved solar mass stars shed their outer layers to form planetary nebulae. WFPC2 images of the very bright infrared source CIT 6 have confirmed that this Extreme Carbon Star is currently forming a planetary nebula with bipolar morphology. Measuring little larger than our Solar System {nearly 100* smaller than its older cousin, the Egg Nebula} CIT 6 is clearly an object in transition. Yet its relative proximity allows the nebula to be studied directly. Planned 3-color imaging over 1.1-2.3 micron and imaging polarimetry in 2 colors will be used to confirm the location and orientation of the presumed dense dusty torus, and to search for the illuminating star{s}. With a rich history of variability both in spectrum and polarization, two well- separated observations are requested to distinguish transient from more permanent structural properties. These data, the first high angular resolution infrared observations of the source, will delineate the thermal structure of the nebula and provide the necessary framework to interpret future satellite and groundbased observations well after the end of the NICMOS mission.
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