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SiO Maser Line-width Diagnostics of AGB Stars and Red Supergiants: The RSG-adjacent Region in the FWZI--Luminosity Plane
Qiu-Yu Tao, Jun-ichi Nakashima, Yong Zhang +3
We investigate whether SiO maser line profiles can distinguish asymptotic giant branch (AGB) stars from red supergiants (RSGs) and identify unusual AGB-classified sources near the…
HI envelope around the carbon star V420 Vul
Xu-Jia Ouyang, Yong Zhang, Chuan-Peng Zhang +1
We report the detection of an extended 21-cm parsec-scale \ion{H}{i} structure toward the Mira variable V420\,Vul using archival Galactic Arecibo L-band Feed Array survey data. The…
FAST search for circumstellar atomic hydrogen. IV. bubbles associated with planetary nebulae
Jun-Yang Liu, Yong Zhang, Xu-Jia Ouyang
Investigating the bubbles generated by the interaction between asymptotic giant branch stellar outflows and the interstellar medium (ISM) is pivotal for elucidating the mechanism b…
Systematic Search for Water Fountain Candidates using the Databases of Circumstellar Maser Sources
Haichen Fan, Jun-ichi Nakashima, D. Engels +6
Water fountains (WFs) are thought to be objects in the morphological evolution of the circumstellar envelopes of low- and intermediate-mass evolved stars, transitioning from spheri…