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Results of KVN Key Science Program for evolved stars

Published online by Cambridge University Press:  07 February 2024

Youngjoo Yun*
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of Korea.
Se-Hyung Cho
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of Korea.
Dong-Hwan Yoon
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of Korea.
Haneul Yang
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of Korea.
Richard Dodson
Affiliation:
International Centre for Radio Astronomy Research, The University of Western Australia, 35 Stirling Highway, Western Australia, Australia
María J. Rioja
Affiliation:
International Centre for Radio Astronomy Research, The University of Western Australia, 35 Stirling Highway, Western Australia, Australia Observatorio Astronómico Nacional (IGN), Alfonso XII, 3 y 5, E-28014 Madrid, Spain
Hiroshi Imai
Affiliation:
Center for General Education, Institute for Comprehensive Education, Kagoshima University 1-21-30 Korimoto, Kagoshima 890-0065, Japan
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Abstract

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We present the results of KVN Key Science Program (KSP) for evolved stars, which was launched in 2014. The first phase of KSP ended in June 2020 and the second phase started in October 2020. The goal of KSP is to study the physical characteristics of the evolved stars by observing the spatial distribution and temporal variability of the stellar masers at four frequency-bands (K, Q, W and D bands). The 22 GHz H2O maser is usually observed from the outer part of circumstellar envelopes compared to the 43, 86, 129 GHz SiO masers, thus the kinematic links between these regions can be studied by the multi-frequency simultaneous observations of KSP along the stellar pulsation cycles. This eventually enable us to study the enormous mass-loss rate of evolved stars, and the accumulated results from KSP are expected to shed light on the study of the late stage of the stellar evolution.

Type
Contributed Paper
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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