ИСТИНА

We present a study of unresolved young massive star clusters (YMCs) and their complexes, embedded in giant HII regions, based on the coupling of spectroscopic with photometric observations of 102 star forming regions in seven spiral galaxies. We derive extinctions, chemical abundances, the impacts of the nebular emission on the total flux, ages, masses, and sizes for YMCs/complexes. We found and studied cases when the gas extinction does not equal to the absorption in the YMCs (YMC complexes). This is due to the spatial offset relative HII cloud the stellar group related to him. Estimates of masses and ages for 63 star forming regions were obtained. The most part of regions are younger than 6 Myr. The lowest mass estimate of 10^4 Msol belongs to the mass interval of the youngest Galactic OCs. We are also discussing the correlations 'age-size', 'size-mass', and 'age-EW(Hα)' for YMCs and their complexes. We confirm the uniform dependence 'size-mass' for YMC complexes and GMCs, m~d^2.