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Young open clusters located in the outer Galaxy provide us with anopportunity to study star formation activity in a different environment fromthe solar neighborhood. We present a UBVI and H alpha photometric study of theyoung open clusters NGC 1624 and NGC 1931 that are situated toward the Galacticanticenter. Various photometric diagrams are used to select the members of theclusters and to determine the fundamental parameters. NGC 1624 and NGC 1931are, on average, reddened by <E(B-V)> = 0.92 +/- 0.05 and 0.74 +/- 0.17 mag,respectively. The properties of the reddening toward NGC 1931 indicate anabnormal reddening law (Rv,cl = 5.2 +/- 0.3). Using the zero-age main sequencefitting method we confirm that NGC 1624 is 6.0 +/- 0.6 kpc away from the Sun,whereas NGC 1931 is at a distance of 2.3 +/- 0.2 kpc. The results fromisochrone fitting in the Hertzsprung-Russell diagram indicate the ages of NGC1624 and NGC 1931 to be less than 4 Myr and 1.5 - 2.0 Myr, respectively. Wederived the initial mass function (IMF) of the clusters. The slope of the IMF(Gamma_NGC 1624 = -2.0 +/- 0.2 and Gamma_NGC 1931 = -2.0 +/- 0.1) appears to besteeper than that of the Salpeter/Kroupa IMF. We discuss the implication of thederived IMF based on simple Monte-Carlo simulations and conclude that theproperty of star formation in the clusters seems not to be far different fromthat in the solar neighborhood.

Sejong Open Cluster Survey (SOS) - IV. The Young Open Clusters NGC 1624 and NGC 1931