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astro-ph.GA2023
Gas-phase molecules in protoplanetary nebulae with the 21 μm emission feature
Jian-Jie Qiu, Yong Zhang, Jun-ichi Nakashima +6
It has been more than 30 years since the enigmatic 21 μm emission feature was first discovered in protoplanetary nebulae (PPNs). Although dozens of different dust carrier candidate…
astro-ph.SR2023
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…