On the photo-evaporation, dust polarization, and kinematics of two
  nebulae in Sh2-236
  In the work presented here, the impact of magnetic field on the dynamical
evolution of cometary globules Sim 129 and Sim 130 in Sh2-236 H\,II region and
the ionized gas streaming out of their surfaces is investigated. The magnetic
field morphology in the region associated with these globules is inferred using
optical polarization measurements with the Sampurnanand Telescope at ARIES. The
nebular emission is probed through radio continuum mapping at 1.4~GHz with the
archival National Radio Astronomy Observatory (NRAO) very large array (VLA) Sky
Survey (NVSS) data. The correlation of these measurements suggest that the
photoevaporated gas from the surfaces of Sim 129 and Sim 130 is accumulated in
clouds and starts streaming along the magnetic field lines. The $\rm ^{12}CO$
(J=1-0) molecular line observations are performed towards NGC\,1893 from 14-m
single dish radio telescope in Taeduk Radio Astronomy Observatory (TRAO). The
velocity dispersion in $\rm ^{12}CO$ (J=1-0) molecular line and the dispersion
in polarization angles are used in Davis-Chandrasekhar-Fermi formulation to
estimate the magnetic field strength towards two sim nebulae. The average value
of field strength is found to be $\sim$60$\mu$G with uncertainty of 0.5 times
the estimated value.
