The environment surrounding Wolf-Rayet ( W-R ) star HD 211853 is studied in molecular , infrared , as well as radio , and Hi emission .
The molecular ring consists of well-separated cores , which have a volume density of 10 ^ { 3 } cm ^ { -3 } and kinematic temperature \sim 20 K. Most of the cores are under gravitational collapse due to external pressure from the surrounding ionized gas .
From the spectral energy distribution modeling toward the young stellar objects , the sequential star formation is revealed on a large scale in space spreading from the W-R star to the molecular ring .
A small-scale sequential star formation is revealed toward core ” A ” , which harbors a very young star cluster .
Triggered star formations are thus suggested .
The presence of the photodissociation region , the fragmentation of the molecular ring , the collapse of the cores , and the large-scale sequential star formation indicate that the ¡°collect and collapse¡± process functions in this region .
The star-forming activities in core ” A ” seem to be affected by the ¡°radiation-driven implosion¡± process .