Using our deep optical and near-infrared photometry along with multiwavelength archival data , we here present a detailed study of the Galactic H ii region Sh 2-305 , to understand the star/star-cluster formation .
On the basis of excess infra-red emission , we have identified 116 young stellar objects ( YSOs ) within a field of view of \sim 18 ^ { \prime } .5 \times 18 ^ { \prime } .5 around Sh 2-305 .
The average age , mass and extinction ( A _ { V } ) for this sample of YSOs are 1.8 Myr , 2.9 M _ { \odot } and 7.1 mag , respectively .
The density distribution of stellar sources along with minimal spanning tree calculations on the location of YSOs reveals at least three stellar sub-clusterings in Sh 2-305 .
One cluster is seen toward the center ( i.e , Mayer 3 ) , while the other two are distributed toward the north and south directions .
Two massive O-type stars ( VM2 and VM4 ; ages \sim 5 Myr ) are located at the center of the Sh 2-305 H ii region .
The analysis of the infrared and radio maps traces the photon dominant regions ( PDRs ) in the Sh 2-305 .
Association of younger generation of stars with the PDRs is also investigated in the Sh 2-305 .
This result suggests that these two massive stars might have influenced the star formation history in the Sh 2-305 .
This argument is also supported with the calculation of various pressures driven by massive stars , slope of mass function/ K -band luminosity function , star formation efficiency , fraction of Class i sources , and mass of the dense gas toward the sub-clusterings in the Sh 2-305 .