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Author (up) Sargent, B.A.; Srinivasan, S.; Speck, A.; Volk, K.; Kemper, C.; Reach, W.T.; Lagadec, E.; Bernard, J.-P.; McDonald, I.; Meixner, M. openurl 
  Title Spitzer-IRS Spectroscopic Studies of Oxygen-Rich Asymptotic Giant Branch Star and Red Supergiant Star Dust Properties Type Conference Article
  Year 2015 Publication Abbreviated Journal  
  Volume Issue Pages 216.03-216.03  
  Abstract We analyze the dust emission features seen in Spitzer Space Telescope Infrared Spectrograph (IRS) spectra of Oxygen-rich (O-rich) asymptotic giant branch (AGB) and red supergiant (RSG) stars. The spectra come from the Spitzer Legacy program SAGE-Spectroscopy (PI: F. Kemper) and other archival Spitzer-IRS programs. The broad 10 and 20 micron emission features attributed to amorphous dust of silicate composition seen in the spectra show evidence for systematic differences in the centroid of both emission features between O-rich AGB and RSG populations. Radiative transfer modeling using the GRAMS grid of models of AGB and RSG stars suggests that the centroid differences are due to differences in dust properties. We present an update of our investigation of differences in dust composition, size, shape, etc that might be responsible for these spectral differences. We explore how these differences may arise from the different circumstellar environments around RSG and O-rich AGB stars. BAS acknowledges funding from NASA ADAP grant NNX13AD54G.  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title American Astronomical Society Meeting Abstracts  
  Series Volume 225 Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes proceedings; Owner: ciska; Added to JabRef: 2015.04.16 Approved no  
  Call Number ASIAA @ ciska @ Serial 42059  
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