Sh 2-301: a blistered H II region undergoing star formation
  We present a multiwavelength study of the H II region Sh 2-301 (S301) using
deep optical data, near-infrared data, radio continuum data and other archival
data at longer wavelengths. A cluster of young stellar objects (YSOs) is
identified in the north-east (NE) direction of S301. The H{\alpha} and radio
continuum images trace the distribution of the ionized gas surrounding a
massive star ALS 207, and the S301 H II region is bounded by an arc-like
structure of gas and dust emission in the south-eastern direction. The
north-western part of S301 seems to be devoid of gas and dust emission, while
the presence of molecular material between the NE cluster and the central
massive star ALS 207 is found. The distribution of warm dust emission, ionized
gas, and neutral hydrogen together suggests a blistered morphology of the S301
H II region powered by ALS 207, which appears to be located near the edge of
the cloud. The location of the NE cluster embedded in the cold molecular cloud
is found opposite to the blistered morphology. There is a noticeable age
difference investigated between the massive star and the NE cluster. This age
difference, pressure calculation, photodissociation regions (PDRs), and the
distribution of YSOs favour the positive feedback of the massive star ALS 207
in S301. On a wider scale of S301, the H II region and the young stellar
cluster are depicted toward the central region of a hub-filamentary system,
which is evident in the infrared images.
