In the planning stage of extremely large telescopes, site testing and study of high performance adaptive optics systems plays very important roles. Site testing is a very time consuming task, therefore, we have built a fully automatic device - the CUTE SCIDAR instrument with a user-friendly interface and real time processing. This instrument is

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We present IPHAS positions and photometry for 4853 sources selected as having a Hα excess from the photometry. The catalogue covers the magnitude range 13

We present analysis of Fabry-Perot interferometric observations for a sample of 11 starburst galaxies with redshift z ≲ 0.03 selected from the Sloan Digital Sky Survey. We have targeted the Hα λ 6562.78 emission line at spatial sampling of 0.2arcsec-0.4 arcsec and at spectral resolution of R ˜ 16 000. Studying two-dimensional maps for the velocity

Aims: The main goal of this work is to explore which elements carry the most information about the birth origin of stars and, as such, which are best suited for chemical tagging. Methods: We explored different techniques to minimize the effect of outlier value lines in the abundances by using Ni abundances derived for 1111 FGK-type stars. We

The accelerated Lambda iteration method is used to obtain better theoretical profiles of He II in hot stars by considering more levels and Stark broadening in the statistical equilibrium equations. It is found that an appropriate He II model atom must consist of 14 non-LTE levels and that Stark broadening must be included for all lines with upper