Results 21 to 30 of about 423 (145)
MONITORING OF SPECTRAL VARIATIONS OF MIRA-TYPE AND SEMIREGULAR VARIABLE STARS
Odessa Astronomical Publications, 2017 The results of monitoring of a sample of late-type variable stars (Mira Ceti-type and semiregulars) are reported. Since 1980 a sample of 60 stars has been observed in the maser line of the H2O molecule at a wavelength of 1.35 cm. These observations are
G. M. Rudnitskij
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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
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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.
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NGC7538 IRS1 N: Modeling a Circumstellar Maser Disk [PDF]
Astrophysics and Space Science, 2005 To appear in The Proceedings of the 2004 European Workshop: "Dense Molecular Gas around Protostars and in Galatic Nuclei", Eds. Y. Hagiwara, W.A. Baan, H.J.
Pestalozzi, M. R. +3 more
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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 ...
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A Study of Hydroxyl Masers in the Circumstellar Envelopes of Long Period Variable Stars [PDF]
, 1980 The 18 cm wavelength maser radiation from long period variable (LPV) stars is emitted by hydroxyl (OH) molecules in the expanding circumstellar envelopes.
Cimerman, Menachem
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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
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Circular polarization of circumstellar water masers around S Per
, 2001 We present the first circular polarization measurements of circumstellar H2O masers. Previously the magnetic field in circumstellar envelopes has been estimated using polarization observations of SiO and OH masers.
Vlemmings, W.H.T. +5 more
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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
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Stellar masers, circumstellar envelopes and supernova remnants [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractThis paper reviews recent advances in the study or circumstellar masers and masers found toward supernova remnants. The review is organized by science focus area, including the astrophysics of extended stellar atmospheres, stellar mass-loss processes and outflows, late-type evolved stellar evolution, stellar maser excitation and chemistry, and ...
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