New ex-OH maser detections in the northern celestial hemisphere
  Aims.Molecular masers, including methanol and hydroxyl masers, and in
particular the ones in excited rotational states (ex-OHmasers), are one of the
most informative tools for studying star-forming regions. So, the discovery, of
new maser sources in theseregions is of great importance. Many studies and
surveys of ex-OH maser sources have been carried out in the southern
celestialhemisphere, but only a few have been done in the northern hemisphere.
The specific aim of this work is to close this gap.Methods.The star-forming
regions in the northern hemisphere with known active methanol masers were
observed to search for newex-OH maser sources with the 32 m and 16 m radio
telescopes of the Ventspils International Radio Astronomy Centre
(VIRAC).Results.Three OH maser lines in the excited state at the 6035 MHz in
three northern hemisphere star-forming regions are detected.The maser
189.030+0.783 was previously known, but we suggest this maser is a possible
variable. We confirm recent detections ofthe ex-OH masers 85.41+0.00 and
90.92+1.49 by other authors. The magnetic field strength in the masering
regions is estimated byusing right circular polarization (RCP) and left
circular polarization (LCP) pair splitting. The high-velocity resolution
provides uswith an estimation of a comparatively small magnetic field strength
for the 189.030+0.783 and 90.92+1.49 star-forming regions
