The Morphology of the Post-Red Supergiant IRC+10420's Circumstellar Ejecta

Details The Morphology of the Post-Red Supergiant IRC+10420's Circumstellar Ejecta The Morphology of the Post-Red Supergiant IRC+10420's Circumstellar Ejecta

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11180h&link_type=abstract

HST Proposal ID #11180. Cycle 16

Computer Science

Scientific paper

The extremely luminous post-red supergiant and powerful OH/IR source IRC +10420 is surrounded by a complex circumstellar nebula. Numerous small condensations, arcs, jet-like rays of knots, and intriguing semi-circular structures are easily visible in our previous WFPC2 images. We have suggested that these spatially recognizable features may be evidence for episodic mass loss events possibly from localized active regions. We now propose to obtain second epoch WFPC2 images with the Planetary Camera to measure the transverse motions of these ejecta. Spatially resolved spectra from STIS showed that the embedded arcs are kinematically distinct from the spherically expanding diffuse nebulosity. The transverse motions in combination with radial velocities from the STIS spectra, will let us determine the morphology of IRC +10420's nebula and the structures embedded in it, its mass loss history, and provide clues to the mass loss mechanism responsible for the discrete ejections.;

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