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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…
The Missing Giant: Do FAST Spectroscopic Observations Reveal a Scarcity of Large Polycyclic Aromatic Hydrocarbons in Astronomical Environments?
Yi Shao, Yong Zhang, Xu-Jia Ouyang +1
The search for large polycyclic aromatic hydrocarbons (PAHs) with over 100 carbon atoms is crucial to resolving the origin of unidentified infrared emission (UIE) bands. These band…
FAST search for circumstellar atomic hydrogen. III. Planetary nebulae at Galactic latitudes |b|>10degree
Xu-Jia Ouyang, Yong Zhang, Albert Zijlstra +4
The detection of circumstellar atomic hydrogen (\ion{H}{1}) via the 21\,cm line remains a persistent challenge in planetary nebula (PN) studies, primarily due to contamination from…
A molecule-rich torus-like structure in the 21 m source IRAS 23304+6147
Hao-Min Sun, Yong Zhang, Xu-Jia Ouyang +4
A long-standing enigma in observational astronomy is the identification of the so-called 21 m feature in a subset of envelopes of post-asymptotic giant branch (post-AGB) stars.…