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VLBI and polarimetric observations of the SiO masers in R Cassiopeiae

1989; IOP Publishing; Volume: 337; Linguagem: Inglês

10.1086/167163

1538-4357

Gordon McIntosh, C. R. Predmore, J. M. Moran, L. J. Greenhill, A. E. E. Rogers, Richard Barvainis,

Stellar, planetary, and galactic studies

view Abstract Citations (44) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS VLBI and Polarimetric Observations of the SiO Masers in R Cassiopeiae McIntosh, G. C. ; Predmore, C. R. ; Moran, J. M. ; Greenhill, L. J. ; Rogers, A. E. E. ; Barvainis, R. Abstract 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. Publication: The Astrophysical Journal Pub Date: February 1989 DOI: 10.1086/167163 Bibcode: 1989ApJ...337..934M Keywords: Masers; Polarization Characteristics; Silicon Oxides; Stellar Envelopes; Interstellar Gas; Polarimetry; Pumping; Very Long Base Interferometry; Astrophysics; MASERS; STARS: CIRCUMSTELLAR SHELLS; INTERFEROMETRY; POLARIZATION; STARS: INDIVIDUAL CONSTELLATION NAME: R CASSIOPEIAE full text sources ADS | data products SIMBAD (1)