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The porous envelope and circumstellar wind matter of the closest carbon star, CW Leonis

Published online by Cambridge University Press:  16 August 2023

Hyosun Kim
Affiliation:
Korea Astronomy and Space Science Institute, 776, Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
Ho-Gyu Lee
Affiliation:
Korea Astronomy and Space Science Institute, 776, Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
Youichi Ohyama
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU, No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C.
Ji Hoon Kim
Affiliation:
SNU Astronomy Research Center, Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
Peter Scicluna
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Santiago RM, Chile
You-Hua Chu
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU, No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C.
Nicolas Mauron
Affiliation:
Laboratoire Univers et Particules, Universite de Montpellier and CNRS, Batiment 13, CC072, Place Bataillon, F-34095 Montpellier, France
Toshiya Ueta
Affiliation:
Department of Physics and Astronomy, University of Denver, 2112 E Wesley Ave., Denver, CO 80208, USA

Abstract

Recent abrupt changes of CW Leonis may indicate that we are witnessing the moment that the central carbon star is evolving off the Asymptotic Giant Branch (AGB) and entering into the pre-planetary nebula (PPN) phase. The recent appearance of a red compact peak at the predicted stellar position is possibly an unveiling event of the star, and the radial beams emerging from the stellar position resemble the feature of the PPN Egg Nebula. The increase of light curve over two decades is also extraordinary, and it is possibly related to the phase transition. Decadal-period variations are further found in the residuals of light curves, in the relative brightness of radial beams, and in the extended halo brightness distribution. Further monitoring of the recent dramatic and decadal-scale changes of this most well-known carbon star CW Leonis at the tip of AGB is still highly essential, and will help us gain a more concrete understanding on the conditions for transition between the late stellar evolutionary phases.

Type
Contributed Paper
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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