Results 1 to 10 of about 604 (76)
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
openaire +3 more sources
The 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 +3 more
openaire +3 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
doaj +1 more source
Submillimeter vibrationally excited water emission from the peculiar red supergiant VY CMa [PDF]
, 2006 Vibrationally excited emission from the SiO and H2O molecules probes the innermost circumstellar envelopes of oxygen-rich red giant and supergiant stars. VY CMa is the most prolific known stellar emission source in these molecules. Observations were made
Alcolea, J. +5 more
core +2 more sources
Is there a maser in the silicon monoxide ground state
The Astrophysical Journal, 1975 Observations are reported of weak emission from the ground vibrational state of SiO in the Orion molecular cloud. It is shown that this emission has a rather smooth low-intensity profile extending over a large velocity range and is present at velocities where maser emissions from the first and second vibrational states are absent.
D. Buhl +3 more
openaire +1 more source
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 ...
openaire +1 more source
Pilot VLBI Survey of SiO v=3 J=1--0 Maser Emission around Evolved Stars [PDF]
, 2012 In this Letter, we report detections of SiO v=3 J=1--0 maser emission in very long baseline interferometric (VLBI) observations towards 4 out of 12 long-period variable stars: WX Psc, R Leo, W Hya, and T Cep.
Cho, Se-Hyung +11 more
core +2 more sources
Molecules in G1.6-0.025 - 'Hot' Chemistry in the Absence of Star Formation at the Periphery of the Galactic Center Region [PDF]
, 2009 We present molecular line mapping of the Giant Molecular Cloud G1.6-0.025, which is located at the high longitude end of the Central Molecular Zone of our Galaxy.
Bachiller +51 more
core +1 more source
First detection of 22 GHz H2O masers in TX Camelopardalis [PDF]
, 2014 Simultaneous time monitoring observations of H$_{2}$O $6_{16}-5_{23}$, SiO $J$ = 1--0, 2--1, 3--2, and $^{29}$SiO $v$ = 0, $J$ = 1--0 lines were carried out in the direction of the Mira variable star TX Cam with the Korean VLBI Network single dish radio ...
Cho, Se-Hyung +2 more
core +1 more source