Circumstellar OH Masers
نویسندگان
چکیده
منابع مشابه
Circumstellar masers
Circumstellar masers are unique tools for probing the envelopes around low mass dying stars using VLBI. In this contribution I briefly review the status of our knowledge on these emissions, especially focusing on the latest results obtained by means of VLBI observations. I also outline some of the new windows that will open for VLBI maser research thanks to the upcoming new instrumentation.
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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. The different maser species (OH, H2O, SiO) have slightly different characteristics and applications. This paper does not concern astrometry o...
متن کاملVLBI astrometry of circumstellar OH masers; proper motions and parallaxes of four AGB stars
The main-line OH masers around 4 AGB stars have been observed with the NRAO Very Long Baseline Array (VLBA) at 8 epochs over a period of 2.5 years. Using a phase referencing technique, the position of the most compact maser spot of each star was monitored with respect to two extragalactic reference sources. For U Her and W Hya, we observe the most blue-shifted maser spot, while for R Cas and S ...
متن کاملOh Masers in G11.904−0.141
The massive star-forming region G11.904−0.141 is one of only 11 sources to show maser emission in the highly-excited 13441 MHz transition of OH. but the 13441 MHz masers are not detected. Consistent magnetic field strengths of approximately +3.5 mG are detected in the ground-state masers, in contrast with a possible −3.0 mG magnetic field previously detected at 13441 MHz. The variable 13441 MHz...
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We present an overview of the long-term H 2 O maser monitoring program of a sample of late-type stars, carried out with the Me-dicina 32-m and Effelsberg 100-m telescopes, and describe the results in some detail. The role the SRT could play in this program is outlined.
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1984
ISSN: 0074-1809
DOI: 10.1017/s0074180900078359