Stellar OH masers and magnetic fields - VLBI observations of U Orionis and IRC +10420

Details Stellar OH masers and magnetic fields - VLBI observations of U Orionis and IRC +10420 Stellar OH masers and magnetic fields - VLBI observations of U Orionis and IRC +10420

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l..89r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 15, 1979, p. L89-L92.

Astronomy and Astrophysics

Astrophysics

58

Circular Polarization, Hydroxyl Emission, Interstellar Masers, Stellar Magnetic Fields, Stellar Radiation, Supergiant Stars, Very Long Base Interferometry, Magnetic Flux, Microwave Spectra

Scientific paper

This letter reports single-antenna and VLBI interferometric observations of the unusual stellar hydroxyl masers U Ori and IRC +10420. It is found that the apparent sizes of all the maser components from -50 to -40 km/s with flux densities greater than 1 Jy in U Ori have increased by at least an order of magnitude over a three-year period, indicating a change in the physical conditions of the masing region, that the integrated 1612-MHz flux density of U Ori decreased by a factor of four over the same period, and that the emission is partly circularly polarized but less than 5% linearly polarized. An interferometric position for the OH maser in IRC +10420 is determined and shown to agree with the optical position within the errors. Magnetic-field strengths of about 10 mG are estimated for the masing regions of both sources, along with surface magnetic fields of approximately 10 G for U Ori and 100 G for IRC +10420.

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