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Asteroseismology of pulsating pre-main sequence (PMS) stars has the potentialof testing the validity of current models of PMS structure and evolution. As afirst step, a sufficiently large sample of pulsating PMS stars has to beestablished, which allows to select candidates optimally suited for a detailedasteroseismological analysis based on photometry from space or ground basednetwork data.  A search for pulsating PMS members in the young open clusters IC 4996 and NGC6530 has been performed to improve the sample of known PMS pulsators. As bothclusters are younger than 10 million years, all members with spectral typeslater than A0 have not reached the zero-age main sequence yet. Hence, IC 4996and NGC 6530 are most suitable to search for PMS pulsation among their A- andF-type cluster stars.  CCD time series photometry in Johnson B and V filters has been obtained forIC 4996 and NGC 6530. The resulting light curves for 113 stars in IC 4996 and194 stars in NGC 6530 have been subject to detailed frequency analyses.  2 delta Scuti-like PMS stars have been discovered in IC 4996 and 6 in NGC6530. For another PMS star in each cluster, pulsation can only be suspected.According to the computed pulsation constants, the newly detected PMS starsseem to prefer to pulsate in a similar fashion to the classical delta Scutistars, and with higher overtone modes.Comment: A&A in prin

Pulsating pre-main sequence stars in IC 4996 and NGC 6530