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Analysing the database for stars in open clusters I. General methods and description of the data
J. -C. Mermilliod, E. Paunzen
We present an overview and statistical analysis of the data included in WEBDA. This database includes valuable information such as coordinates, rectangular positions, proper motion…
CCD photometric search for peculiar stars in open clusters. V. NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756
E. Paunzen, H. M. Maitzen, O. I. Pintado
We have investigated 1008 objects in the area of five intermediate age open clusters (NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756) via the narrow band Delta a-system. The d…
On application of multi-colour photometry of Scuti stars
J. Daszy{ń}ska-Daszkiewicz, W. A. Dziembowski, A. A. Pamyatnykh
In Scuti star models, the photometric amplitudes and phases exhibit a strong dependence on convection, which enters through the complex parameter, , which describes the bolo…
A study of the stability regions in the planetary system HD 74156 - Can it host earthlike planets in habitable zones?
R. Dvorak, E. Pilat-Lohinger, B. Funk +1
Using numerical methods we thoroughly investigate the dynamical stability in the region between the two planets found in HD 74156. The two planets with minimum masses 1.56 M_JUP (H…
The 5200A flux depression of chemically peculiar stars: I. Synthetic Delta a photometry - the normality line
F. Kupka, E. Paunzen, H. M. Maitzen
The Delta a photometric system provides an efficient observational method to identify and distinguish magnetic and several other types of chemically peculiar (CP) stars of spectral…