منابع مشابه
Multi - epoch Imaging Polarimetry of the SiO Masers in the Extended Atmosphere of the Mira Variable TX Cam
We present a time series of synoptic images of the linearly-polarized v = 1, J = 1−0 SiO maser emission toward the Mira variable, TX Cam. These data comprise 43 individual epochs at an approximate biweekly sampling over an optical pulsation phase range of φ = 0.68 to φ = 1.82. The images have an angular resolution of ∼ 500μas and were obtained using the Very Long Baseline Array
متن کاملA Movie of a Star: Multi-epoch Vlba Imaging of the Sio Masers towards the Mira Variable Tx Cam
We describe an observing campaign using the Very Long Baseline Array (VLBA) to monitor the time-evolution of the v = 1, J = 1−0 SiO maser emission towards the Mira variable TX Cam. The data reported here cover the period 1997 May 24 to 1999 February 19, during which the SiO maser emission was im-aged at approximately biweekly intervals. The result is an animated movie at an angular resolution o...
متن کاملSiO and CH3OH mega-masers in NGC 1068
Maser is an acronym for microwave amplification by stimulated emission of radiation; in astronomy mega-masers are masers in galaxies that are ≥ 10(6) times more luminous than typical galactic maser sources. Observational studies of mega-masers can help us to understand their origins and characteristics. More importantly, mega-masers can be used as diagnostic tracers to probe the physical proper...
متن کاملThe origin of strong magnetic fields in circumstellar SiO masers
We suggest that the Parker instability, acting in the regions where shocks form in response to stellar pulsations, gives rise to the fragments in which SiO masers exist in the atmospheres of evolved stars. The production of maser fragments in this manner is compatible with the Alfvén speeds in them greatly exceeding their kinematic and thermal speeds. Themagnetic structure in an evolved star’s ...
متن کاملA VLBI polarization study of SiO masers towards VY CMa
Maser emission from the SiO molecule has been widely observed in the nearcircumstellar envelopes of late-type, evolved stars. VLBI images can resolve individual SiO maser spots, providing information about the kinematics and magnetic field in the extended atmospheres of these stars. This poster presents full polarization images of several SiO maser lines towards the supergiant star VY CMa. VY C...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2005
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20041658