Results 1 to 10 of about 423 (145)
Circumstellar masers in the Magellanic Clouds [PDF]
Astronomy and Astrophysics, 2001 We have searched for 22 GHz H2O and 43/86/129 GHz SiO masers in bright IRAS point sources in the SMC and LMC, to test whether the kinematics of the mass loss from these stars depends on metallicity. H2O masers were detected in the red supergiants IRAS04553-6825 and IRAS05280-6910, and tentatively in the luminous IR object IRAS05216-6753 and the AGB ...
Jacco Th Van Loon, A A Zijlstra
exaly +4 more sources
Methanol Masers as Tracers of Circumstellar Disks [PDF]
Astrophysical Journal, 1998 We show that in many methanol maser sources the masers are located in lines, with a velocity gradient along them which suggests that the masers are situated in edge-on circumstellar, or protoplanetary, disks. We present VLBI observations of the methanol maser source G309.92+0.48, in the 12.2 GHz transition, which confirm previous observations that the ...
R P Norris, P J Diamond, S P Ellingsen
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MODELS OF CIRCUMSTELLAR MASERS IN BIPOLAR OUTFLOWS
Odessa Astronomical Publications, 2017 Sources of molecular maser radio emission in envelopes of late-type variable stars (red giants and supergiants) are considered. Radio and optical data on asymmetry of mass loss process in red giants are briefly reviewed.
G. M. Rudnitskij
doaj +3 more sources
On Water Masers in Circumstellar Shells
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
B M Lewis
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Faraday Depolarization and Circumstellar SiO Masers
Astrophysical Journal, 1997 Calculations are performed for the creation and transport of linearly polarized maser radiation in the presence of Faraday depolarization due to free electrons. Attention is limited to magnetic field strengths for which the characteristic Zeeman splitting gΩ is much less than the spectral line breadth Δω—the regime that ordinarily is appropriate for ...
William D Watson
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Submillimetre water masers in circumstellar envelopes [PDF]
Monthly Notices of the Royal Astronomical Society, 1995 J A Yates, R J Cohen, Richard E Hills
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Symposium - International Astronomical Union, 1984 Synthesis maps of stellar OH maser emission have revealed that the OH lies in expanding spherical shells typically about 1016 cm in diameter. From the maps and the expansion velocity, derived from the OH spectrum, stellar mass loss rates may be determined. Typical values are 10−5 M⊙/yr.
R. S. Booth, P. J. Diamond, R. P. Norris
openaire +1 more source
Polarized Maser Emission with In-source Faraday Rotation
The Astrophysical Journal, 2023 We discuss studies of polarization in astrophysical masers with particular emphasis on the case where the Zeeman splitting is small compared to the Doppler profile, resulting in a blend of the transitions between magnetic substates.
T. L. Tobin, M. D. Gray, A. J. Kemball
doaj +1 more source
Simultaneous Time-monitoring Observations of H2O and SiO Masers toward the Supergiant VX Sagittarii
The Astrophysical Journal Supplement Series, 2023 We performed simultaneous monitoring observations of the 22.2 GHz H _2 O and 43.1/42.8/86.2/129.3 GHz SiO masers toward the red supergiant VX Sagittarii using the Korean VLBI Network single-dish telescopes.
Dong-Hwan Yoon +4 more
doaj +1 more source
Astrometry of Circumstellar Masers [PDF]
, 2003 8 pages, 2 figures, to appear in "Mass-losing Stars and their Circumstellar Matter", eds Y. Nakada & M.
van Langevelde, H. J. +1 more
openaire +2 more sources