Results 51 to 60 of about 2,871 (139)
Considerations on the Origin of IRAS 19312+1950 Based on Long-term Maser Observations
The Astrophysical JournalIRAS source 19312+1950 (hereafter I19312) is an infrared point source with maser emissions of SiO, H _2 O, and OH molecules. Although initial observations suggested that I19312 might be an evolved star, its characteristics are not fully consistent with ...
Huan-Xue Feng +7 more
doaj +1 more source
Maser Studies in Evolved Stars
, 2009 High resolution maps of maser emission provide very detailed information on processes occurring in circumstellar envelopes of late-type stars.
Colomer, Francisco
core +1 more source
Proper Motion of Water Masers Associated with IRAS 21391+5802: Bipolar Outflow and an AU-Scale Dusty Circumstellar Shell [PDF]
, 2000 We present VLBA observations of water maser emission associated with the star-forming region IRAS 21391+5802, which is embedded in a bright rimmed cometary globule in IC1396. The angular resolution of the maps is about 0.8 mas, corresponding to a spatial
Brand J. +11 more
core +3 more sources
Systematic Search for Water Fountain Candidates Using the Databases of Circumstellar Maser Sources
The Astrophysical Journal Supplement SeriesWater fountains (WFs) are thought to be objects in the morphological evolution of the circumstellar envelopes of low- and intermediate-mass evolved stars, transitioning from spherically symmetric to asymmetric shapes.
Haichen Fan +8 more
doaj +1 more source
The Remarkable Mid-Infrared Jet of Massive Young Stellar Object G35.20-0.74
, 2006 The young massive stellar object G35.20-0.74 was observed in the mid-infrared using T-ReCS on Gemini South. Previous observations have shown that the near infrared emission has a fan-like morphology that is consistent with emission from the northern lobe
Forster J. R. +4 more
core +1 more source
Infrared variability, maser activity, and accretion of massive young stellar objects [PDF]
, 2017 Methanol and water masers indicate young stellar objects. They often exhibit flares, and a fraction shows periodic activity. Several mechanisms might explain this behavior but the lack of concurrent infrared (IR) data complicates to identify the cause ...
Garatti, A. Caratti o +5 more
core +2 more sources
The Hamburg Database of Circumstellar OH Masers [PDF]
Proceedings of the International Astronomical Union, 2012 AbstractA new version of the Hamburg Database of Circumstellar OH Masers at 1612, 1665, and 1667 MHz was released in 2012 January. The database now lists 13170 OH maser observations of stars in the Milky Way. They belong to 6318 different objects and 2324 of them were detected in at least one of the transitions. The database contains flux densities and
openaire +1 more source
CH3OH Thermal Lines Traces 6.7 GHz CH3OH Maser Variation of High-mass Protostar G353.273+0.641
The Astrophysical JournalThis 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 +3 more
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The Astrophysical Journal Supplement SeriesWe 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 +6 more
doaj +1 more source
On Water Masers in Circumstellar Shells
The Astrophysical Journal, 1998 Detection rates for 22 GHz water masers from O-rich circumstellar shells are always less than 100%. This can in part be understood by revisiting high angular-resolution observations of masers in OH 39.7 + 1.5 and red supergiants. The pattern of occurrence for water masers around the pulsation cycle of OH 39.7 + 1.5 suggests that a detectable maser only
openaire +1 more source