3 papers
astro-ph.SR2026
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…
astro-ph.GA2025
Considerations on the Origin of IRAS 19312+1950 Based on Long-Term Maser Observations
Huan-Xue Feng, Jun-ichi Nakashima, D. Engels +5
IRAS source 19312+1950 (hereafter I19312) is an infrared point source with maser emissions of SiO, HO, and OH molecules. Although initial observations suggested that I19312 mig…
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…