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The region surrounding the well-known reflection nebula, NGC 7023,illuminated by a Herbig Be star, HD 200775, located in the dark cloud L1174 isstudied in this work. Based on the distances and proper motion values from GaiaDR2 of 20 previously known young stellar object candidates, we obtained adistance of 335$\pm$11 pc to the cloud complex L1172/1174. Using polarizationmeasurements of the stars projected on the cloud complex, we show additionalevidence for the cloud to be at $\sim$ 335 pc distance. Using this distance andproper motion values of the YSO candidates, we searched for additional comovingsources in the vicinity of HD 200775 and found 20 new sources which show lowinfrared excess emission and are of age $\sim$ 1 Myr. Among these, 10 YSOcandidates and 4 newly identified comoving sources are found to show X-rayemission. Three of the four new sources for which we have obtained opticalspectra show H$\alpha$ in emission. About 80% of the total sources are foundwithin $\sim$ 1 pc distance from HD 200775. Spatial correlation of some of theYSO candidates with the Herschel dust column density peaks suggests that starformation is still active in the region and may have been triggered by HD200775.

A census of young stellar population associated with the Herbig Be star HD 200775