Results 51 to 60 of about 423 (145)

Astrometry of the stellar image of U Her amplified by the circumstellar 22 GHz water masers

, 2002
The 22 GHz H2O masers in the circumstellar envelope of the Mira variable star U Her have been observed with MERLIN using a phase referencing technique to determine accurate astrometric positions.
W. H. T. Vlemmings, Vlemmings, W.H.T., P. J. Diamond, H. J. van Langevelde, Diamond, P.J., Langevelde, H.J. van   +5 more
core   +1 more source

Variability of water masers in evolved stars on timescales of decades [PDF]

, 2018
For several decades (1987-2015) we have been carrying out observations of water masers in the circumstellar envelopes (CSE's) of Mira variables, Red Supergiants (RSG's) and Semi-Regular Variables (SRV's) with the Medicina 32-m and Effelsberg 100-m ...
Winnberg, Anders, BRAND, JAN, Engels, Dieter   +2 more
core   +1 more source

CH3OH Thermal Lines Traces 6.7 GHz CH3OH Maser Variation of High-mass Protostar G353.273+0.641

The Astrophysical Journal
This study reports an analysis of the 6.7 GHz CH _3 OH maser in the high-mass protostar G353.273+0.641 (G353), utilizing data from the Tianma Radio Telescope.
Shi-Min Song, Xi Chen, Sheng-Yuan Liu, Jun-Ting Liu   +3 more
doaj   +1 more source

Long-term Simultaneous Monitoring Observations of SiO and H2O Masers toward the Mira Variable WX Serpentis

The Astrophysical Journal Supplement Series
We present the results from long-term simultaneous monitoring observations of SiO and H _2 O masers toward the Mira variable star WX Serpentis. This study has been conducted with 21 m single-dish radio telescopes of the Korean VLBI Network from 2009 June
Jang-Ho Lim, Jaeheon Kim, Se-Hyung Cho, Hyosun Kim, Dong-Hwan Yoon, Seong-Min Son, Kyung-Won Suh   +6 more
doaj   +1 more source

SiO masers in Mira variables at a single stellar phase

, 1996
A hydrodynamic pulsation model for long-period M-type Mira variables is used to estimate the physical conditions of number density, temperature and velocity field in the circumstellar envelope of a model star of 1 M⊙, 332-d period, surface temperature ...
Humphreys, E. M L, Field, D., Gray, MD, Bowen, G, Yates, JA, Yates, J. A., Bowen, G., Diamond, P. J., Diamond, PJ, Field, D, Humphreys, EML, Gray, M. D.   +11 more
core   +3 more sources

SiO v = 1 J = 5 → 4 Maser Emission from the Root of the “Water Fountain” Source W 43A

The Astrophysical Journal
We report here the first mapping of SiO v = 1 J  = 5 → 4 maser emission toward the “water fountain” source W 43A in order to explore the central stellar system driving the collimated, bipolar, fast jet.
Hiroshi Imai, Takeshi Hoshino, Daniel Tafoya, José F. Gómez, Jun-ichi Nakashima, Gabor Orosz   +5 more
doaj   +1 more source

Discovery of SiO masers in the Water Fountain source, IRAS 16552-3050 [Elektronisk resurs]

, 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.
Amada, Kei,, Orosz, G.,, Hamae, Yuhki,, Shum, K. Y.,, Uscanga, L.,, Gomez, J. F.,, Imai, H.,, Tafoya, Daniel,, Nakashima, Keisuke,, Burns, R. A.,   +9 more
core   +1 more source

Water and silicon-monoxide masers monitored towards the water fountain sources

, 2021
We have investigated the evolution of 12 water fountain sources in real time in the accompanying H2O 2o and SiO masers through our FLASHING (Finest Legacy Acquisitions of SiO-/ H2O 2o-maser Ignitions by Nobeyama Generation) project. It has been confirmed
Uscanga, L., Tafoya, Daniel, Amada, Kei, Burns, R. A., Shum, K. Y., Imai, H., Hamae, Yuhki, Gomez, J. F., Nakashima, K., Orosz, G.   +9 more
core   +1 more source

Imaging the Jet of MWC 349A with Resolved Radio Recombination Line Emission from ALMA

The Astrophysical Journal Letters
Jets and disk winds arise from materials with excess angular momentum ejected from the accretion disks in forming stars. How these structures are launched and how they impact the gas within the innermost regions of these objects remains poorly understood.
Antonio Martínez-Henares, Qizhou Zhang, Izaskun Jiménez-Serra, Jesús Martín-Pintado, Nuria Huélamo, Sirina Prasad, James Moran, Alejandro Báez-Rubio   +7 more
doaj   +1 more source

First VLBI mapping of circumstellar

, 2005
We report the first VLBI map of the $v=0$ $J=$ 1–0 maser line of 29SiO in the long-period variable star IRC +10011. We have found that this maser emission is composed of multiple spots distributed in an incomplete ring, suggesting that this maser is ...
J.-F. Desmurs, K. B. Marvel, F. Colomer, R. Soria-Ruiz, J. Alcolea, V. Bujarrabal   +5 more
core   +1 more source