Evidence for a 2-h optical modulation in GS 1826 – 24 |
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| Authors: | L Homer P A Charles & D O'Donoghue |
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| Institution: | Istituto di Radioastronomia del C.N.R., Stazione VLBI di Noto, C.P. 141, Noto (SR), Italy,;University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, Cheshire SK11 9DL |
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| Abstract: | OH maser emission from the circumstellar envelope of the M-type supergiant VX Sagittarii has been mapped at 1612 MHz in both hands of circular polarization using MERLIN, with an angular resolution of 0.4 arcsec and a velocity resolution of 0.3 km s?1. Four likely Zeeman pairs of maser components are identified, each with a similar Zeeman splitting. The inferred magnetic field strength is approximately ?1 mG in each case, with the field directed towards us. The Zeeman components lie ～ 1400 au from the star. The data lend support to the dipole magnetic field model which has recently been suggested for this circumstellar envelope. |
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| Keywords: | magnetic fields masers circumstellar matter stars: individual: VX Sgr infrared: stars radio lines: stars |
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