OH observations of V1057 Cygni

Details OH observations of V1057 Cygni OH observations of V1057 Cygni

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....80..260a&link_type=abstract

Astronomy and Astrophysics, vol. 80, no. 3, Dec. 1979, p. 260-264. Research supported by the Max-Planck-Institut für Radioastro

Astronomy and Astrophysics

Astrophysics

15

Cygnus Constellation, Hydroxyl Emission, Interstellar Masers, Brightness Temperature, Circular Polarization, Radial Velocity, Stellar Magnetic Fields, Water Masers, Zeeman Effect

Scientific paper

The paper presents observations of the 1720-MHz OH line from V1057 Cygni in the period 1973-1974. The line is composed of two circularly polarized components. The intensity of both components has decreased roughly exponentially with a time constant of 125 d and the separation of the two components has decreased from about 0.35 to less than 0.15 km/sec. If the line splitting has a Zeeman origin the magnetic field has decreased from about 3.0 to less than 1.3 mG. A possible model explaining this effect is discussed. The 1665 and 1667-MHz lines from the surrounding dust cloud were also detected.

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