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The very young open cluster NGC 6383 centered on the O-star binary HD 159176is an interesting place for studying the impact of early-type stars with strongradiation fields and powerful winds on the formation processes of low-massstars. To investigate this process, it is necessary to determine thecharacteristics (age, presence, or absence of circumstellar material) of thepopulation of low-mass pre-main-sequence (PMS) stars in the cluster. Weobtained deep U B V (R I)_c H-alpha photometric data of the entire cluster aswell as medium-resolution optical spectroscopy of a subsample of X-ray selectedobjects. Our spectroscopic data reveal only very weak H-alpha emission lines ina few X-ray selected PMS candidates. We photometrically identify a number ofH-alpha emission candidates but their cluster membership is uncertain. We findthat the fainter objects in the field of view have a wide range of extinction(up to A_V = 20), one X-ray selected OB star having A_V ~ 8. Our investigationuncovers a population of PMS stars in NGC 6383 that are probably coeval with HD159176. In addition, we detect a population of reddened objects that areprobably located at different depths within the natal molecular cloud of thecluster. Finally, we identify a rather complex spatial distribution of H-alphaemitters, which is probably indicative of a severe contamination by foregroundand background stars.

A photometric and spectroscopic investigation of star formation in the very young open cluster NGC6383