Accurate measurements of the positions of OH maser sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Hydroxyl Emission, Interstellar Masers, Position (Location), Variable Stars, H Ii Regions, Hydrogen Ions, Mira Variables, Orion Nebula, Radial Velocity, Radio Sources (Astronomy)

Scientific paper

The Jodrell Bank Mk IA-Mk III interferometer has been used to measure the positions of 1665 and 1667 MHz OH maser emission from seven sources. The positional accuracy ranges from 0.1 to 3 arcsec. Five of the sources (W3 OH, NGC 7538, Orion A, ON2 and W49) are associated with H II regions and the remaining two (R Cas and S CrB) are associated with Mira variable stars.

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