VLBI and polarimetric observations of the SiO masers in R Cassiopeiae
Creators
- 1. Haystack Observatory, Westford, MA (USA)
- 2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA)
- 3. Massachusetts Univ., Amherst (USA)
Description
The spatial structure, polarization characteristics, and temporal variability of the SiO emission in the v = 1, J = 1 approaching 0 masing transition from the late-type star R Cassiopeia were studied. From VLBI observations, it was found that the emission regions are clumpy. Some regions show well-defined polarization characteristics. The maser regions are distributed over a projected area having a diameter of several stellar radii. The variations in the flux density from all regions occur in phase with the star's optical variations. The coincidence of these variations puts a lower limit on the speed with which the pumping mechanism interacts with the masing regions. Polarization characteristics derived from the high spatial resolution VLBI experiment are similar to those obtained from the low spatial resolution (single antenna) measurements. 29 references
Additional details
Publishing Information
- Journal Title
- Astrophysical Journal
- Journal Volume
- 337
- Series
- Astrophys. J.
- Journal Page Range
- 934-944
- ISSN
- 0004-637X
- CODEN
- ASJOA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 20067288
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- COSMIC GASES; EMISSION SPECTRA; FLUX DENSITY; INTERFEROMETRY; INTERSTELLAR SPACE; MASERS; MORPHOLOGICAL CHANGES; POLARIMETERS; POLARIZATION; PUMPS; SILICON OXIDES; STARS; VARIATIONS
- Descriptors DEC
- AMPLIFIERS; CHALCOGENIDES; ELECTRONIC EQUIPMENT; EQUIPMENT; FLUIDS; GASES; MICROWAVE AMPLIFIERS; MICROWAVE EQUIPMENT; OXIDES; OXYGEN COMPOUNDS; SILICON COMPOUNDS; SPACE; SPECTRA