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We present a multiwavelength investigation of the young stellar populationand star formation activities around the \hii region Sharpless 311. Using ourdeep near-infrared observations and archival {\it Spitzer}-IRAC observations,we have detected a total of 125 young stellar objects (YSOs) in an area of$\sim$86 arcmin$^2$. The YSOs sample include 8 Class I and 117 Class IIcandidate YSOs. The mass completeness of the identified YSOs sample isestimated to be 1.0 \msun. The ages and masses of the majority of the candidateYSOs are estimated to be in the range of $\sim$0.1$-$5 Myr and $\sim$0.3$-$6\msun, respectively. The 8 \mum image of S311 displays an approximatelyspherical cavity around the ionizing source which is possibly created due tothe expansion of the \hii region. The spatial distribution of the candidateYSOs reveals that a significant number of them are distributed systematicallyalong the 8 $\mu$m emission with a majority clustered around the eastern borderof the \hii region. Four clumps/compact \hii regions are detected in the radiocontinuum observations at 1280 MHz, which might have been formed during theexpansion of the \hii region. The estimated dynamical age of the region,main-sequence lifetime of the ionizing source, the spatial distribution andages of the candidate YSOs indicate triggered star formation in the complex.

A multiwavelength investigation of the HII region S311: Young stellar population and star formation