In a sample of six young open clusters ( NGC 1502 , NGC 3105 , Stock 16 , NGC 6268 , NGC 7235 , and NGC 7510 ) we 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 NGCÂ 3105 is most important because of the still unknown influence of the global metallicity gradient of the Milky Way .
These findings confirm that CP stars are present in open clusters of very young ages ( log t \geq 6.90 ) at galactocentric distances up to 11.4 kpc .
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 .