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Statistical properties of cold circumstellar envelops observed in NESS–NRO

Published online by Cambridge University Press:  16 August 2023

K. Amada Open the ORCID record for K. Amada [Opens in a new window] ,
S. Fukaya ,
H. Imai ,
P. Scicluna ,
N. Hirano ,
A. Trejo-Cruz ,
S. Zeegers ,
F. Kemper ,
S. Srinivasan  and
S. Wallström
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K. Amada
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, Japan
S. Fukaya
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, Japan
H. Imai
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, Japan Center for General Education, Institute for Comprehensive Education, Kagoshima University
P. Scicluna
Affiliation:
European Southern Observatory, Alonso de Cordova Santiago RM, Chile Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan
N. Hirano
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan
A. Trejo-Cruz
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan
S. Zeegers
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan
F. Kemper
Affiliation:
European Southern Observatory, Alonso de Cordova Santiago RM, Chile European Southern Observatory, Karl-Schwarzschild-Str. 2, Germany
S. Srinivasan
Affiliation:
Instituto de Radioastronoma y Astrofsica, UNAM, Mexico
S. Wallström
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan Institute of Astronomy, KU Leuven, Belgium
T. Dharmawardena
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan Max-Planck-Institute for Astronomy, Königstuhl 17, Germany
H. Shinnaga
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, Japan
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Abstract

We conducted CO J=1→0 emission line observations for nearby AGB stars using the Nobeyama 45 m telescope. Comparing our results with those from CO J=3→2 observations with JCMT, the circumstellar envelopes observed in CO J=1→0 look more extended than J=3→2. Thus, we could trace the outer, cold parts of the envelopes. We also found four stars in which the CO/13CO ratio changes dramatically outward, but the change implies the effect of selective photodissociation by interstellar ultraviolet radiation, not the third dredge up in the stellar interior. We moreover found two unique stars with aspherical envelope morphology.

Keywords

stars: AGB and post-AGBstars: mass lossstars: windsoutflowsstars: carbon
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S370: Winds of Stars and Exoplanets , August 2021 , pp. 97 - 99
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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References

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