Bac. - "The Q-Methode as a modern tool to deredden hot stars"
Bac. - "The properties of B/Ae/shell stars"
Bac. - "RV Tauri Variables: Chaos oder Pulsation?"
Bac. - "What criteria are appropriate to classify stars?"
Bac. - "Methods to determine the density in the interstellar medium"
Bac. - "Determination of rotational velocity by means of classification spectra"
Bac. - "Chemically peculiar stars within the Johnson UBVRI system"
Bac. - "Chemically peculiar stars within the Stromgren uvbybeta system"
Bac. - "Chemically peculiar stars within the Geneva system"
Bac. - "Are metal weak F stars intermediate Population II objects?"

Dipl. - "Calibration of metallicity"
A comparison of the current methods of the photometric metallicity calibration by means of spectroscopic data.

Dipl. - "Monte Carlo simulations"
By means of Monte Carlo Simulations theoretic main sequences and the initial mass function should be calculated and compared to observations of open clusters.

Dipl. - "Open clusters of the milky way"
More diploma theses are possible within that topic. Based on the database WEBDA the following works can be done

• Determination of age, metallicity and distance of some selected clusters
• Comparison of published isochrones by means of well investigated clusters
• Methods for determination of cluster membership
• Properties of interesting groups like Blue Stragglers, supergiants, chemically peculiar or T Tauri stars
• Multivariate analysis of photometric indices
• Creation of interstellar reddening maps
• Statistical investigation of divers parameters

Dipl. - "Rotation along the main sequence"
The dependence between average rotational velocity an evolutionary status of main sequence stars should be analysed.

Dipl. - "Spectroscopic binaries"
The percentage of double star systems in the milky way is about 50%, although they are often treated as single stars. The effect of close binaries on photometric indices and absolute brightness should be investigated. The results can then be compared with already available data.