Investigating star formation in the young open cluster NGC 6383

Context: By studying young open clusters, the mechanisms important for star formation over several Myr can be examined. For example, accretion rate as a function of rotational velocity can be investigated. Similarly, sequential star formation triggered by massive stars with high mass-loss rates can be studied in detail. Aims: We identified and characterized probable members of NGC 6383, as well as determined cluster parameters. Methods: New Strömgren uvby CCD photometry, obtained by us, is presented. This new data, together with Johnson UBV and 2MASS data in the NIR, was used to investigate characteristics of pre- as well as zero age main sequence cluster members. Results: We present Strömgren uvby CCD photometry for 272 stars in the field of NGC 6383 and derive its reddening, E(b-y) = 0.21(4) mag, as well as distance, d = 1.7(3) kpc from the Sun. Several stars with NIR excess and objects in the domain of the classical Herbig Ae/Be and T Tauri stars were detected. Two previously known variables were identified as rapidly-rotating PMS stars. The field population is clearly separated from the probable members in the color-magnitude diagram. Conclusions: . NGC 6383 is a young open cluster, with an age of less than 4 Myr, undergoing continuous star formation. True pre-main sequence members might be found down to absolute magnitudes of +6 mag, with a variety of rotational velocities and stellar activities.