Results 41 to 50 of about 2,871 (139)

Polarization properties of OH masers in AGB and post-AGB stars

, 2011
Context: Ground-state OH maser emission from late-type stars is usually polarized and remains a powerful probe of the magnetic field structure in the outer regions of circumstellar envelopes if observed with high angular and spectral resolutions ...
Amiri, Bains, Bains, Bains, Baud, Baud, Bedijn, Benson, Benson, Bowers, Bowers, Chapman, Chapman, Claussen, Cohen, Cohen, Cook, Deacon, Deguchi, E. Gérard, Eder, Elitzur, Etoka, Etoka, Fix, Fong, Goldreich, Goldreich, Gray, Habing, Jewell, Le Squeren, Likkel, M. Szymczak, Norris, Olnon, P. Wolak, Reid, Sevenster, Sevenster, Sevenster, Sivagnanam, Szymczak, Szymczak, Szymczak, Szymczak, te Lintel Hekkert, van der Veen, Vlemmings, Whitelock, Wilson, Wilson, Wilson, Zell, Zijlstra   +54 more
core   +2 more sources

Testing the Hypothesis that Methanol Maser Rings Trace Circumstellar Disks: High Resolution Near-IR and Mid-IR Imaging

, 2012
Milliarcsecond VLBI maps of regions containing 6.7 GHz methanol maser emission have lead to the recent discovery of ring-like distributions of maser spots and the plausible hypothesis that they may be tracing circumstellar disks around forming high mass ...
Anna Bartkiewicz, Beuther, Beuther, Caswell, Cohen, Cotera, Cutri, De Buizer, De Buizer, De Buizer, James M. De Buizer, Jayawardhana, Marian Szymczak, McCaughrean, Minier, Norris, Reid, Robitaille, Schenck, Shu, Stecklum, Zhang   +21 more
core   +1 more source

Circumstellar water vapour in M-type AGB stars: Constraints from H2O(1_10 - 1_01) lines obtained with Odin [PDF]

, 2008
Aims: Spectrally resolved circumstellar H2O(1_10 - 1_01) lines have been obtained towards three M-type AGB stars using the Odin satellite. This provides additional strong constrains on the properties of circumstellar H2O and the circumstellar envelope ...
Aa. Sandqvist, Agúndez, Anders, B. Larsson, Bains, Cernicharo, Cernicharo, Chapman, Cherchneff, Colomer, Danchi, de Graauw, F. L. Schöier, Feast, Flower, Gonzalez Garcia, González Delgado, González-Alfonso, González-Alfonso, Green, H. Olofsson, Habing, Hasegawa, Höfner, Jeong, Justtanont, Justtanont, K. Justtanont, Knapp, M. Maercker, M. Olberg, Maercker, Mamon, Melnick, Melnick, Menten, Menten, Miyoshi, Netzer, Neufeld, Nordh, Olberg, Olofsson, P. Bergman, Phillips, Ramstedt, Reid, Rothman, Ryde, S. Kwok, Schöier, Schöier, Schöier, Schöier, Schöier, Sylvester, Szymczak, Tevousjan, U. Frisk, Willacy, Winters, Wittkowski, Woitke, Zubko, Å. Hjalmarson   +64 more
core   +2 more sources

Phase–Referencing Observations of Galactic Circumstellar Masers [PDF]

International Astronomical Union Colloquium, 1998
AbstractTwo projects are discussed in which a phase referencing technique is used to determine stellar parallaxes and/or proper motions by means of the circumstellar masers. The observations are special in the sense that both continuum and line sources need to be detected.
Huib Jan van Langevelde, Loránt O. Sjouwerman, Philip J. Diamond, Richard T. Schilizzi, Alain Baudry   +4 more
openaire   +1 more source

Investigating Asymmetry Development from SiO to H2O Maser Regions in VX Sagittarii

The Astronomical Journal
Simultaneous 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, Se-Hyung Cho, Youngjoo Yun, Haneul Yang, Jaeheon Kim   +4 more
doaj   +1 more source

Circumstellar masers

, 2004
8 pages. 1 figure. Proceedings of the 7th European VLBI Network Symposium held in Toledo, Spain on October 12-15, 2004. Editors: R. Bachiller, F. Colomer, J.-F. Desmurs, P. de Vicente (Observatorio Astronomico Nacional), p. 169-176.
openaire   +2 more sources

Infrared Spectral Energy Distribution Modeling of Velocity Excess in Maser Sources: Identifying Incipient Water Fountain Candidates

The Astrophysical Journal
We 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, Jun-ichi Nakashima, Yong Zhang   +2 more
doaj   +1 more source

Mapping the circumstellar SiO maser emission in R Leonis [PDF]

Astronomy & Astrophysics, 2007
accepted for publication in A& ...
Soria-Ruiz, R., Alcolea, J., Colomer, F., Bujarrabal, V., Desmurs, J. -F.   +4 more
openaire   +2 more sources

Equatorial Enhancement in the Dustiest OH/IR Stars in the Galactic Bulge

The Astrophysical Journal
We have detected the 10 μ m silicate feature and the 11.3 μ m crystalline forsterite feature in absorption in 21 oxygen-rich asymptotic giant branch stars in the Galactic bulge.
Steven R. Goldman, Jacco Th. van Loon, Olivia C. Jones, Joris A. D. L. Blommaert, Martin A. T. Groenewegen   +4 more
doaj   +1 more source

Masers

, 2011
An astrophysical MASER (Microwave Amplification by Stimulated Emission of Radiation) is a source of stimulated spectral line emission. Maser emission is observed from the circumstellar envelopes of evolved stars, molecular clouds/star-forming regions ...
Humphreys, Elizabeth
core   +1 more source