NOAO >   Observing Info >   Approved Programs >   2009A-0278

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Proposal Information for 2009A-0278


PI: Stefanie Wachter, California Institute of Technology, wachter@ipac.caltech.edu
Address: Spitzer Science Center, 1200 E California Blvd, Pasadena, CA 91125, USA

CoI: Schuyler Van Dyk, SSC / Caltech
CoI: Sean Carey, SSC/ Caltech
CoI: Donald Hoard, SSC / Caltech
CoI: Patrick Morris, SSC / Caltech

Title: The Nature of Mid-Infrared Circumstellar Shells discovered with the \em Spitzer Space Telescope

Abstract: We have discovered a large number of circular and elliptical shells around luminous central sources at 24(micron) with the MIPS instrument on- board the Spitzer Space Telescope. The shells are only visible at 24(mu)m, but many of the central stars are detected in the 2MASS catalog. Most however, lack an optical counterpart, indicating that we are dealing with a population of highly obscured objects. Our archival follow-up effort has revealed 99% of these sources to be previously unknown, and we ask here for IR spectroscopic observations of the central stars of these shells to determine their nature and reveal potentially unifying characteristics for this new population of sources.


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NOAO >   Observing Info >   Approved Programs >   2009A-0278

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