FLASHING: Project overview
Journal article, 2023
This paper describes an overview of the FLASHING (Finest Legacy Acquisitions of SiO-/H2O-maser Ignitions by the Nobeyama Generation) project promoted using the 45 m telescope of Nobeyama Radio Observatory, which aims to intensively monitor H2O (at 22 GHz) and SiO (at 43 GHz) masers associated with so-called "water fountain" sources. Here we show scientific results based on the data taken in the first five seasons of FLASHING, from 2018 December to 2023 April. We show the evolution of the H2O maser spectra, discovering new spectral components that break the record of the jet's top speed and/or systematic velocity drifts in the spectrum indicating acceleration or deceleration of the maser gas clumps. For the 43 GHz SiO maser emission, we newly detect it in one source and find that it is no longer present in another source. This implies that the jets from these water fountains can be accelerated or decelerated, and show how circumstellar envelopes are destroyed.
stars: mass loss
stars: winds and outflows
masers
stars: jets
stars: AGB and post-AGB
Author
Hiroshi Imai
Kagoshima University
Yuhki Hamae
Kagoshima University
Kei Amada
Kagoshima University
Keisuke Nakashima
Kagoshima University
Ka-Yiu Shum
Kagoshima University
Rina Kasai
Kagoshima University
Jose F. Gomez
Institute of Astrophysics of Andalusia (IAA)
Lucero Uscanga
Universidad de Guanajuato
Daniel Tafoya
Chalmers, Space, Earth and Environment, Onsala Space Observatory
Gabor Orosz
Joint Institute for VLBI in Europe (JIVE)
Ross A. Burns
University of New Mexico
RIKEN
Publication of the Astronomical Society of Japan
0004-6264 (ISSN) 2053051x (eISSN)
Vol. 75 6 1183-1213Subject Categories
Meteorology and Atmospheric Sciences
Astronomy, Astrophysics and Cosmology
DOI
10.1093/pasj/psad064