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CNO Abundances in Metal Poor Unevolved StarsWe 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 starsIsraelian, Garik et al.
Fecha de publicación:
02000 -
Chandra position of GRB000210.Not AvailableGarmire, G. et al.
Fecha de publicación:
02000 -
Can Double-Peaked Lines Indicate Merging Effects in AGNs?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 AGNsPopovic, L. C. et al.
Fecha de publicación:
02000 -
Calculations of Self-Absorption Curves of Metallic Emission Lines in Emission Line StarsNot AvailableSocas-Navarro, H. et al.
Fecha de publicación:
02000 -
Brown Dwarfs in Open ClustersOver 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)Osorio, Maria Rosa Zapatero
Fecha de publicación:
02000