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Comparative Studies of the Dust around Red Supergiant and Oxygen-Rich Asymptotic Giant Branch Stars in the Local Universe

Published online by Cambridge University Press:  27 October 2016

B. A. Sargent ,
S. Srinivasan ,
A. Speck ,
K. Volk ,
F. Kemper ,
W. Reach ,
E. Lagadec ,
J.-P. Bernard ,
I. McDonald  and
M. Meixner
...Show all authors
B. A. Sargent
Affiliation:
Center for Imaging Science and Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, 54 Lomb Memorial Drive, 17-3195, Rochester, NY 14623, USA, email: baspci@rit.edu
S. Srinivasan
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan
A. Speck
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA
K. Volk
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, 21218, USA
F. Kemper
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan
W. Reach
Affiliation:
Universities Space Research Association, MS 232-11, Moffett Field, CA 94035, USA
E. Lagadec
Affiliation:
Laboratoire Lagrange, UMR7293, Université Côte d'Azur, CNRS, Observatoire de la Côte d'Azur, Boulevard de l'Observatoire, 06304 Nice Cedex 4, France
J.-P. Bernard
Affiliation:
CNRS, IRAP, 9 Av. Colonel Roche, BP 44346, F-31028 Toulouse Cedex 4, France Université de Toulouse, UPS-OMP, IRAP, F-31028 Toulouse Cedex 4, France
I. McDonald
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Alan Turing Building, Oxford Road, Manchester M13 9PL, UK
M. Meixner
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, 21218, USA
G. C. Sloan
Affiliation:
Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, NY 14853, USA
O. Jones
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD, 21218, USA
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Abstract

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We analyze the dust emission features seen in Spitzer Space Telescope Infrared Spectrograph (IRS) spectra of red supergiant (RSG) and oxygen-rich asymptotic giant branch (AGB) stars in the Large Magellanic Cloud and Small Magellanic Cloud galaxies and in various Milky Way globular clusters. The spectra come from the Spitzer Legacy program SAGE-Spectroscopy (PI: F. Kemper), the Spitzer program SMC-Spec (PI: G. Sloan), 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 investigate 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 and assess effects of varying metallicity (LMC versus SMC versus Milky Way globular cluster) and other properties (mass-loss rate, luminosity, etc.) on the dust originating from these stars. BAS acknowledges funding from NASA ADAP grant NNX13AD54G.

Keywords

stars: AGB and post-AGB(stars:) circumstellar matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 470 - 471
Copyright
Copyright © International Astronomical Union 2016 

References

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