Results 21 to 30 of about 121 (110)
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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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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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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Excited-state OH Masers in the Water Fountain Source IRAS 18460-0151
The Astrophysical Journal LettersWater fountain objects are generally defined as evolved stars with low to intermediate initial mass accompanied by high-velocity molecular jets detectable in the 22.235 GHz H _2 O maser line.
Xu-Jia Ouyang +5 more
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A Search for Asymmetric Kinematic Components in Circumstellar Envelopes Using OH Main Line Masers
The Astrophysical JournalCircumstellar OH maser lines are useful for studying the dynamics of the circumstellar envelope (CSE) around evolved stars. This study aims to identify CSEs around cold stars, which exhibit deviations from the spherical expansion, by comparing the ...
Jia-Yong Xie +2 more
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Mapping the circumstellar SiO maser emission in R Leonis [PDF]
Astronomy & Astrophysics, 2007 accepted for publication in A& ...
Soria-Ruiz, R. +4 more
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FAST Detection of OH Emission in the Carbon-rich Planetary Nebula NGC 7027
The Astrophysical JournalWe present the first detection of the ground-state OH emission line at 1612 MHz toward the prototypical carbon-rich planetary nebula (PN) NGC 7027, utilizing the newly installed ultrawideband (UWB) receiver of the Five-hundred-meter Aperture Spherical ...
Xu-Jia Ouyang +10 more
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Investigating Asymmetry Development from SiO to H2O Maser Regions in VX Sagittarii
The Astronomical JournalSimultaneous very-long-baseline interferometry monitoring observations of H _2 O and SiO masers toward VX Sagittarii were conducted from 2014 February to 2019 January.
Dong-Hwan Yoon +4 more
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The Astrophysical JournalWe investigated whether “velocity excess” in circumstellar maser lines can diagnose the earliest evolutionary phases of water fountains (WFs). Here, we define “velocity excess” as maser emission (e.g., H _2 O 22.235 GHz or OH 1665/1667 MHz) detected at ...
Jia-Yong Xie +2 more
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