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Extended Dust Emission from Nearby Evolved stars

Published online by Cambridge University Press:  30 December 2019

Thavisha E. Dharmawardena ,
Francisca Kemper ,
Peter Scicluna ,
Jan G. A. Wouterloot Open the ORCID record for Jan G. A. Wouterloot [Opens in a new window] ,
Alfonso Trejo ,
Sundar Srinivasan ,
Jan Cami Open the ORCID record for Jan Cami [Opens in a new window] ,
Albert Zijlstra ,
Jonathan P. Marshall  and
the NESS collaboration
Thavisha E. Dharmawardena
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sect. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C. Graduate Institute of Astronomy, National Central University, 300 Zhongda Road, Zhongli 32001, Taoyuan, Taiwan, R.O.C. email: tdharmawardena@asiaa.sinica.edu.tw
Francisca Kemper
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sect. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C.
Peter Scicluna
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sect. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C.
Jan G. A. Wouterloot
Affiliation:
East Asian Observatory, 660 N A’ohoku Place, Hilo, Hawaii 96720, USA
Alfonso Trejo
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sect. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C.
Sundar Srinivasan
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sect. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C.
Jan Cami
Affiliation:
Department of Physics and Astronomy and Centre for Planetary Science and Exploration, TheUniversity of Western Ontario, London, ON N6A 3K7, Canada SETI Institute, 189 Bernardo Ave, Suite 100, Mountain View, CA 94043, USA
Albert Zijlstra
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK Laboratory for Space Research, University of Hong Kong, Pokfulam Road, Hong Kong
Jonathan P. Marshall
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sect. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C.
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Abstract

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We derive azimuthally-averaged surface-brightness profiles of 16 AGB stars in the far-IR and sub-mm with the aim of studying the resolved historic mass loss in the extended circumstellar envelope. The PSF-subtracted extended component fluxes were found to be ∼40% of the total source flux. By fitting SEDs at each radial point we derive the dust temperature, column density and spectral index of emissivity via Bayesian inference. The measured dust-to-gas ratios were somewhat consistent with canonical values however with a large scatter.

Keywords

stars: AGB and post-AGBstars: circumstellar matterstars: mass-loss
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 181 - 185
Copyright
© International Astronomical Union 2019 

References

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