Results 21 to 30 of about 2,871 (139)
Bipolar outflows as a repulsive gravitational phenomenon -- Azimuthally Symmetric Theory of Gravitation (II) [PDF]
, 2010 This paper is part of a series on the Azimuthally Symmetric Theory of Gravitation (ASTG) which is built on Laplace-Poisson's well known equation. We show herein that the emergent equations from the ASTG, under some critical conditions determined by the ...
Nyambuya, G. G.
core +1 more source
Masers in Circumstellar Shells [PDF]
Symposium - International Astronomical Union, 1987 Presumably due to a cosmic accident, circumstellar masers are almost exclusively found in oxygen rich stars with [0/C] >1. The exception here is the SiS maser found towards IRC 10216 (Henkel et al. (1985)) but I will ignore this in what follows and concentrate this review upon the circumstellar shells where OH, H2O, and SiO masers are found in ...
openaire +1 more source
The circumstellar environment of methanol masers [PDF]
Symposium - International Astronomical Union, 2002 We present VLBI and BIMA observations of the Class II methanol maser source G 59.783+0.065. The methanol emission arises from the centre of a compact molecular core, supporting the view that methanol masers trace an early stage of massive star formation.
Chris Phillips +3 more
openaire +1 more source
Interpretation of Circumstellar Masers [PDF]
Symposium - International Astronomical Union, 1980 In a short review paper one is often forced to survey the subject in a broad way and to ignore many, perhaps even important, details. Such is the case here. My remarks are intended to indicate how I view the current status of the field. In general, I shall avoid qualifying my statements, even when I am clearly guilty of oversimplification.
openaire +1 more source
H2O masers in circumstellar envelopes
The Astrophysical Journal, 1987 The spatial structure of H/sub 2/O maser emission at 22.235 GHz for 12-late-type variable stars has been measured with a resolution of 0.07 arcsec. The H/sub 2/O maser regions of Mira variables range from 9 or less to 108 AU in total extent, while those of supergiant long-period variables are 300-720 AU in extent.
Adair P. Lane +4 more
openaire +1 more source
A database of circumstellar OH masers update
Proceedings of the International Astronomical Union, 2022 AbstractThe database of circumstellar OH masers by Engels & Bunzel (2015) was updated to include new 1612, 1665, and 1667 MHz OH maser observations published between 2015 and 2022. A cross-correlation of the database was made with infrared catalogues (AllWISE and 2MASS) and with GAIA DR3.
Dieter Engels, Belen López-Martí
openaire +1 more source
Continuum emission associated with 6.7-GHz methanol masers
, 1995 We have used the Australia Telescope Compact Array (ATCA) to search for continuum emission toward three strong 6.7-GHz methanol maser sources. For two of the sources, G339.88-1.26 and NGC 6334F (G351.42+0.64), we detect continuum emission closely ...
Ellingsen, S. P. +2 more
core +2 more sources
A renewed search for water maser emission from Mira variables [PDF]
, 1997 There is an approximately 60% detection rate for 1612 MHz masers in association with red, color-selected IRAS sources, though few are detected from the bluer circumstellar shells of Mira variables. On the other hand and complementarily, past, pre-IRAS 22
Arecibo Pr, B. M. Lewis
core +3 more sources
Methanol Masers—Are They in Circumstellar Disks? [PDF]
International Astronomical Union Colloquium, 1998 AbstractSince the discovery of the 12.2 and 6.7 GHz methanol maser lines, these masers have been studied in great detail. Even in the earliest studies, it appeared that in some fraction of the sources, the maser spots were arranged in lines. This contrasts with the well-studied OH and water masers, in which the masers tended to be clustered almost ...
R. P. Norris +2 more
openaire +1 more source
High resolution observations of SiO masers: comparing the spatial distribution at 43 and 86 GHz
, 2004 We present sub-milliarcsecond observations of SiO masers in the late-type stars IRC +10011 and Chi Cyg. We have used the NRAO Very Long Baseline Array (VLBA) to map the 43 GHz (v=1, 2 J=1-0) and the 86 GHz (v=1, 2 J=2-1) SiO masers.
Alcolea +46 more
core +1 more source