The Morphology of IRC 10420's Circumstellar Ejecta - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: Images of the circumstellar ejecta associated with the post-red supergiantIRC +10420 show a complex ejecta with visual evidence for episodic mass loss.In this paper we describe the transverse motions of numerous knots, arcs andcondensations in the inner ejecta measured from second epoch {\it HST-WFPC2}images. When combined with the radial motions for several of the features, thetotal space motion and direction of the outflows show that they were ejected atdifferent times, in different directions, and presumably from separate regionson the surface of the star. These discrete structures in the ejecta arekinematically distinct from the general expansion of the nebula and theirmotions are dominated by their transverse velocities. They are apparently allmoving within a few degrees of the plane of the sky. We are thus viewing IRC+10420 nearly pole-on and looking nearly directly down onto its equatorialplane. We also discuss the role of surface activity and magnetic fields on IRC+10420-s recent mass loss history.



Author: Chelsea Tiffany, Roberta M. Humphreys, Terry J. Jones, Kris Davidson

Source: https://arxiv.org/



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