Discovery of SiO masers in the Water Fountain source, IRAS 16552-3050
Paper in proceeding, 2022
We report new detections of SiO ν = 1 and ν = 2 J = 1 → 0 masers in the water fountain source IRAS 16552-3050, which was observed with the Nobeyama 45 m telescope from March 2021 to April 2023. Water fountains are evolved stars whose H2O maser spectra trace high-velocity outflows of >100 Km s-. This is the second known case of SiO masers in a water fountain, after their prototypical source, W 43A. The line-of-sight velocity of the SiO masers are blue-shifted by ∼25 km s-1 from the systemic velocity. This velocity offset imply that the SiO masers are associated with nozzle structure formed by a jet penetrating the circumstellar envelope, and that new gas blobs of the jet erupted recently. Thus, the SiO masers imply this star to be in a new evolutionary stage.
outfows
stars: AGB and post-AGB
stars: winds
masers
stars: mass loss
Author
Kei Amada
Kagoshima University
H. Imai
Kagoshima University
Yuhki Hamae
Kagoshima University
Keisuke Nakashima
Kagoshima University
K. Y. Shum
Kagoshima University
Daniel Tafoya
Chalmers, Space, Earth and Environment, Onsala Space Observatory
L. Uscanga
Universidad de Guanajuato
J. F. Gomez
Institute of Astrophysics of Andalusia (IAA)
G. Orosz
Joint Institute for VLBI in Europe (JIVE)
R. A. Burns
National Astronomical Observatory of Japan
RIKEN
Proceedings of the International Astronomical Union
1743-9213 (ISSN) 1743-9221 (eISSN)
Vol. 18 359-361Subject Categories
Water Engineering
Astronomy, Astrophysics and Cosmology
Oceanography, Hydrology, Water Resources
DOI
10.1017/S1743921323002739