Details

Autor(en) / Beteiligte

• Yun, Youngjoo
• Cho, Se-Hyung
• Yoon, Dong-Hwan
• Yang, Haneul
• Dodson, Richard
• Rioja, María J.
• Imai, Hiroshi

Titel

Results of KVN Key Science Program for evolved stars

Ist Teil von

• Proceedings of the International Astronomical Union, 2022-12, Vol.18 (S380), p.324-327

Ort / Verlag

Cambridge, UK: Cambridge University Press

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.