Within the sample of six young open clusters (NGC 1502, NGC 3105, Stock 16, NGC 6268, NGC 7235 and NGC 7510) we have investigated 1753 objects using the narrow band, three filter Delta a photometric system resulting in the detection of eleven bona-fide magnetic chemically peculiar (CP) stars and five Be or metal-weak stars. The results for the distant cluster NGC 3105 is most important because of the still unknown influence of the global metallicity gradient of the Milky Way. These findings confirms that CP stars are present in open clusters of very young ages (logt>=6.90) at galactocentric distances up to 11.4kpc. For all programme clusters the age, reddening and distance modulus were derived using the corresponding isochrones. Some additional variable stars within Stock 16 could be identified by comparing different photometric studies.

Cone search capability for table J/A+A/443/157/table8 (Observed program stars of NGC 7235)

Cone search capability for table J/A+A/443/157/table4 (Observed program stars of NGC 1502)

Cone search capability for table J/A+A/443/157/table5 (Observed program stars of NGC 3105)

Cone search capability for table J/A+A/443/157/table6 (Observed program stars of Stock 16)

Cone search capability for table J/A+A/443/157/table7 (Observed program stars of NGC 6268)

Cone search capability for table J/A+A/443/157/table9 (Observed program stars of NGC 7510)