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A large infrared shell associated with BI Crucis

McCollum, Bruce and Bruhweiler, Frederick C. and Wahlgren, Glenn M. and Eriksson, Mattias and Verner, Ekaterina (2008) A large infrared shell associated with BI Crucis. Astrophysical Journal, 682 (2). pp. 1087-1094. ISSN 0004-637X.

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Spitzer IRAC and MIPS images reveal a large dust emission feature ~6' in diameter which appears to be a shell in close proximity to, and perhaps physically related to, the D-type Mira symbiotic BI Cru. Smaller optical lobes are already known to be emanating from some symbiotics including BI Cru. However, this is the first extended structure found in the IR which is associated with a symbiotic Mira system. The IR shell of BI Cru is more than 5 times larger in arc size than the star's optical lobe. Published distance estimates imply that the IR shell is ~4 to ~8 pc in diameter, which is larger than the largest optical lobe known to be associated with any Mira symbiotic system. The large disparity between its IR and optical shell sizes, along with what appear to be multiple intersecting arcs, suggest that BI Cru has undergone multiple mass-loss episodes. A trend of rapidly increasing brightness toward longer wavelengths, along with a much more diffuse structure at 70 μm than at shorter wavelengths, and suggests a greater abundance of relatively colder and older dust which may be the remnant of earlier mass outflows.

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Additional Information:© 2008 The American Astronomical Society. Received 2007 November 26; accepted 2008 April 4. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. This work has used of SAOImage DS9, developed by Smithsonian Astrophysical Observatory; data from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/ California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation; and the SIMBAD database, operated at CDS, Strasbourg, France. We thank an anonymous referee for useful comments.
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Subject Keywords:binaries: symbiotic; ISM: bubbles; stars: individual (BI Crucis); stars: mass loss; stars: winds, outflows
Issue or Number:2
Record Number:CaltechAUTHORS:20090427-084137925
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14079
Deposited By: Tony Diaz
Deposited On:07 Aug 2009 18:20
Last Modified:03 Oct 2019 00:46

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