We present a study of C, N, and O abundances for 24 unevolved metalpoor stars with metallicities in the range -0.3 [Fe/H] -3. New C and N abundances have been measured using high resolution spectroscopy of the CH and NH bands at 3145 and 3360 Å, respectively. We also discuss the oxygen abundances obtained by Israelian et al. [10] for these stars

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The influence of merging effects in the central part of an Active Galactic Nucleus (AGN) on the emission spectral line shapes are discussed. We present a model of close binary Broad Line Region. The numerical experiments show that the merging effects can explain double peaked lines. The merging effects may also be present in the center of AGNs

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Over the last two decades, many efforts have been devoted to the search for brown dwarfs, and various ways of finding them have been developed. Deep photometric surveys in nearby open clusters is one approach that has provided a large amount of candidates. These clusters offer a number of advantages (a single known distance, metallicity and age)

Over the last two decades, many efforts have been devoted to the search for brown dwarfs, and various ways of finding them have been developed. Deep photometric surveys in nearby open clusters is one approach that has provided a large amount of candidates. These clusters offer a number of advantages (a single known distance, metallicity and age)