The influence of spot saturation on DIMM seeing measurements
The DIMM is a widely accepted and often used instrument for seeing measurements. Nevertheless, its incorrect use may give rise to errors in seeing values. A...
Galaxy mergers and interactions are mechanisms which should drive the formation of bars. Therefore, we could expect that the fraction of barred galaxies...
We present Keck K-band observations of GX 17+2 which reveal a bright counterpart in the radio error circle of Deutsch et al. (1999), coincident with their star...
The Infrared Nuclear Emission of Seyfert Galaxies on Parsec Scales: Testing the Clumpy Torus Models
We present subarcsecond resolution mid-infrared (mid-IR) photometry in the range from 8 to 20 μm of 18 nearby Seyfert galaxies, reporting high spatial...
The infrared overluminosity of young, ultracool substellar objects
Most young, ultracool substellar objects with spectral types later than M9 show very red mid-infrared colors up to 24~micron, significantly redder than expected...
The Initial--Final Mass Relationship of White Dwarfs in Common Proper Motion Pairs
A promising approach to decrease the uncertainties in the initial--final mass relationship, which is still poorly constrained, is to study white dwarfs for...