Results 1 to 10 of about 2,871 (139)

Circumstellar masers in the Magellanic Clouds [PDF]

Astronomy & Astrophysics, 2001
We have searched for 22 GHz H2O and 43/86/129 GHz SiO masers in bright IRAS point sources in the SMC and LMC, to test whether the kinematics of the mass loss from these stars depends on metallicity.
A. A. Zijlstra, Alcolea, Alcolea, Bedding, Bica, Blommaert, Bohannan, Bujarrabal, Castilho, Cernicharo, Cioni, Colomer, Diamond, Elias, Feast, Fehrenbach, Goldreich, González-Alfonso, Groenewegen, Groenewegen, Groenewegen, Haikala, Haikala, Hall, Hall, Harvey, Henize, Herpin, Huggins, Izumiura, J. Th. van Loon, Kim, Kwok, L.-Å. Nyman, Laval, Laval, Le Bertre, Lewis, Lewis, Lewis, Lindqvist, Lindqvist, Lindqvist, Loup, Loup, Luks, Meaburn, Meyssonnier, Morris, Netzer, Norris, Nyman, Nyman, Osterbrock, Parker, Persi, Prévot, Rebeirot, Reid, Reid, Richards, Romanik, Rosado, Schiavon, Sivagnanam, Sivagnanam, Sivagnanam, Sjouwerman, Smith, Stanimirovic, Staveley-Smith, Takaba, Trams, V. Bujarrabal, van Loon, van Loon, van Loon, van Loon, van Loon, van Loon, Westerlund, Whitelock, Whiteoak, Wood, Wood, Wood, Wood, Wood, Yates, Zijlstra   +89 more
core   +4 more sources

A database of circumstellar OH masers [PDF]

Astronomy & Astrophysics, 2015
We present a new database of circumstellar OH masers at 1612, 1665, and 1667 MHz in the Milky Way galaxy. The database (version 2.4) contains 13655 observations and 2341 different stars detected in at least one transition.
Bunzel, F., Engels, D.
core   +5 more sources

Circular Polarization of Circumstellar Water Masers around S Per [PDF]

Astronomy & Astrophysics, 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.
Barvainis, Deguchi, Diamond, Elitzur, Fiebig, Genzel, H. J. van Langevelde, Kemball, Kemball, Kukolich, Masheder, Moran, Nedoluha, Nedoluha, P. J. Diamond, Richards, Szymczak, W. Vlemmings, Walker, Wiebe   +19 more
core   +8 more sources

Stellar masers, circumstellar envelopes, and supernova remnants [PDF]

Proceedings of the International Astronomical Union, 2007
This 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
Alvarez, Athol J. Kemball, Bessel, Colomer, Cotton, Cotton, Deguchi, Goss, Habing, Humphreys, Imai, Menten, Morris, Pardo, Sevenster, Sevenster, Sevenster, Soria-Ruiz, Szczerba, van Langevelde, Vlemmings, Vlemmings, Wittkowski, Yi   +23 more
core   +2 more sources

Astrometry of circumstellar masers [PDF]

, 2002
The circumstellar masers around evolved stars offer an interesting possibility to measure stellar parameters through VLBI astrometry. In this paper the application of this technique is discussed, including the accuracy and the uncertainties of the method.
A Eckart, F Colomer, HJ Langevelde Van, HJ Langevelde Van, KM Menten, LO Sjouwerman, P Sivagnanam   +6 more
core   +4 more sources

Methanol Masers as Tracers of Circumstellar Disks [PDF]

The Astrophysical Journal, 1998
We show that in many methanol maser sources the masers are located in lines, with a velocity gradient along them which suggests that the masers are situated in edge-on circumstellar, or protoplanetary, disks.
A. K. Tzioumis, C. J. Phillips, Caswell J. L., Caswell J. L., Cragg D. M., E. R. Troup, Ellingsen S. P., Ellingsen S. P., Ellingsen S. P., Ellingsen S. P., Gaylard M. J., J. E. Reynolds, K. J. Wellington, M. J. Kesteven, MacLeod G. C., MacLeod G. C., MacLeod G. C., Menten K. M., Norris R. P., P. J. Diamond, P. M. McCulloch, R. G. Gough, R. H. Ferris, R. P. Norris, S. E. Byleveld, S. P. Ellingsen, Schutte A. J., Sinclair M. W., Y. Takahashi   +28 more
core   +4 more sources

MODELS OF CIRCUMSTELLAR MASERS IN BIPOLAR OUTFLOWS

Odessa Astronomical Publications, 2017
Sources of molecular maser radio emission in envelopes of late-type variable stars (red giants and supergiants) are considered. Radio and optical data on asymmetry of mass loss process in red giants are briefly reviewed.
G. M. Rudnitskij
doaj   +2 more sources

Circumstellar OH Masers [PDF]

Symposium - International Astronomical Union, 1984
Synthesis maps of stellar OH maser emission have revealed that the OH lies in expanding spherical shells typically about 1016 cm in diameter. From the maps and the expansion velocity, derived from the OH spectrum, stellar mass loss rates may be determined. Typical values are 10−5 M⊙/yr.
R. S. Booth, P. J. Diamond, R. P. Norris
openaire   +1 more source

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

Simultaneous Time-monitoring Observations of H2O and SiO Masers toward the Supergiant VX Sagittarii

The Astrophysical Journal Supplement Series, 2023
We performed simultaneous monitoring observations of the 22.2 GHz H _2 O and 43.1/42.8/86.2/129.3 GHz SiO masers toward the red supergiant VX Sagittarii using the Korean VLBI Network single-dish telescopes.
Dong-Hwan Yoon, Se-Hyung Cho, Haneul Yang, Youngjoo Yun, Jaeheon Kim   +4 more
doaj   +1 more source