Results 1 to 10 of about 63 (52)
Silicon-monoxide masers show up in infrared stars
Physics Today, 1974 Radio telescopes, scanning the heavens at millimeter wavelengths, have detected maser emissions on several lines from vibrationally excited states of silicon monoxide. Until now, the only maser emissions from space have come from OH and H2O molecules, at centimeter wavelengths.
Lubkin Gloria B
exaly +3 more sources
Water vapor and silicon monoxide maser observations in the protoplanetary nebula OH 231.8+4.2 [PDF]
Astronomy & Astrophysics, 2007 Context. OH 231.8+4.2 is a well studied preplanetary nebula (pPN) around a binary stellar system that shows a remarkable bipolar outflow. Aims. To study the structure and kinematics of the inner 10-80AU nebular regions probed by SiO and H 2 O maser emission, where the agents of wind collimation are expected to operate, in order to gain insights into ...
J.-F. Desmurs +4 more
core +4 more sources
The Spatial Structure of Silicon Monoxide Masers [PDF]
Symposium - International Astronomical Union, 1984 VLBI observations of stellar masers provide important constraints on models for maser excitation and for the dynamics and physical conditions in circumstellar envelopes. The spatial distribution and apparent sizes of Si0 masers toward several late type variable stars and toward the star-forming region in Orion have been measured using the 75 km ...
Adair P. Lane
openaire +2 more sources
Water and silicon-monoxide masers monitored towards the “water fountain” sources
Proceedings of the International Astronomical Union, 2021 AbstractWe 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 that these masers are excellent probes of new jet blob ejections, acceleration of the ...
H. Imai +9 more
openaire +2 more sources
Vibrationally Excited Silicon Monoxide Masers
Symposium - International Astronomical Union, 1980 Published data on a select group of SiO maser sources have been analyzed for velocity variations as a function of phase. No apparent correlation was found to a level of about 2 km/s. This places constraints on the location of the maser molecules. Such a correlation should be present at some level.
D. Buhl +6 more
openaire +2 more sources
Astronomical Journal, 1978 Seven Mira variable stars with silicon monoxide maser emission have been found. All are later than M4 and heavily reddened. Two were observed near maximum light. One, Y Cas, seems to bear out the correlation of 43-GHz SiO maser luminosity and mean spectral type at maximum light. RT Aql, however, falls about 1 mag below the expected brightness.
D F Dickinson, L E Snyder
exaly +2 more sources
Silicon monoxide masers and the magnetic field of R Cassiopeiae [PDF]
, 2012 Silicon monoxide maser emission has been detected in many evolved stars in circumstellar envelopes in different vibrationally-excited rotational transitions. It is considered a good tracer to study the dynamics in a region close to the photosphere of the star.
Al Muntafki, Khudhair Abbas Assaf
openaire +2 more sources
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
An Updated Reference Frame for the Galactic Inner Parsec
The Astrophysical Journal, 2023 Infrared observations of stellar orbits about Sgr A* probe the mass distribution in the inner parsec of the Galaxy and provide definitive evidence for the existence of a massive black hole.
Jeremy Darling +5 more
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