Crossing the Yellow Void: Spatially Resolved Spectroscopy of the Hypergiant IRC+10420

Details Crossing the Yellow Void: Spatially Resolved Spectroscopy of the Hypergiant IRC+10420 Crossing the Yellow Void: Spatially Resolved Spectroscopy of the Hypergiant IRC+10420

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19915803d&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #158.03; Bulletin of the American Astronomical Society, Vol. 34, p.567

Astronomy and Astrophysics

Astronomy

Scientific paper

IRC+10420 is a post-red-supergiant at the empirical luminosity boundary in the HR diagram. It has now reached a stage in its blueward evolution where increasing opacity deranges the atmosphere. Indeed, its wind is so dense that it is opaque and hides the underlying star. We have obtained HST/STIS spectroscopy with spatial resolution good enough to separate the star from its complex ejecta. The ejecta form essentially a reflection nebula, allowing us to view the star from a range of directions. The kinematics of the ejecta cannot easily be reconciled with existing models with either an equatorial disk or a bipolar outflow. Therefore we propose a model with irregular, asymmetric mass loss. Local instabilities allow inflowing and outflowing material to coexist.

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