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IRC +10420 - A cool hypergiant near the top of the H-R diagram
Jones, Terry Jay; Humphreys, Roberta M.; Gehrz, Robert D.; Lawrence, Geoffrey F.; Zickgraf, Franz-Josef; Moseley, Harvey; Casey, Sean; Glaccum, William J.; Koch, Carol J.; Pina, Robert; Jones, Barbara; Venn, Kim; Stahl, Otmar; Starrfield, Sumner G.
AA(Minnesota Univ., Minneapolis), AB(Minnesota Univ., Minneapolis), AC(Minnesota Univ., Minneapolis), AD(Minnesota Univ., Minneapolis), AE(Landessternwarte Königstuhl, Heidelberg, Germany), AF(NASA, Goddard Space Flight Center, Greenbelt, MD), AG(NASA, Goddard Space Flight Center, Greenbelt, MD), AH(U.S. Navy, Naval Research Lab., Washington), AI(Minnesota Univ., Minneapolis), AJ(California Univ., La Jolla)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 323-335. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Cool Stars, Hertzsprung-Russell Diagram, Infrared Imagery, Stellar Evolution, Supergiant Stars, Visible Spectrum, Astronomical Photometry, H Alpha Line, Polarimetry, Stellar Mass Ejection
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New observations were obtained for the OH/IR star IRC +10420, including optical/infrared imaging, spectroscopy, polarimetry, and photometry. The observations, which indicate a very rich and complex circumstellar environment for the star. A model for IRC +10420 star is proposed, in which a true core-burning supergiant is surrounded by a rotating equatorial disk of gas and dust that is viewed from about midway above the plate.

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