All Galactic black hole binaries with low mass donor stars are transient X-ray sources; we expect most of the X-ray transients observed in external galaxies to...

We present two selected photoionization models of the extragalactic H ii region NGC 2363, and compare them with three sets of observational data. We discuss the...

For two sunspot groups observed in June 1992 we analyze the center-to-limb variation and height dependence of various geometrical parameters describing the...

In this presentation, we describe several months of monitoring of Gault since January 2019 using various telescopes and instrumentation. The goal is to...

We report the discovery of a strong correlation between the shape of a bulge's light-profile and the mass of its central supermassive black hole (Mbh). We find...

Photometric results for the galaxy NGC 4736 are presented, including IR and visible profiles. After correction for the extinction within the galaxy based on...

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A new photometric system suitable for deep, precise and quick metallicity mapping in galaxies is proposed. We find a linear correlation between our metallicity...

The INT photometric H-alpha Survey (IPHAS; http://www.iphas.org) is now near completion. A band of 10 degrees along the Northern Galactic Plane is being imaged...