Search Publications
Spectral energy distributions and colours of hot subluminous stars
Irrgang, Andreas; Heber, Ulrich; Schaffenroth, Johannes
Photometric surveys at optical, ultraviolet, and infrared wavelengths provide ever-growing datasets as major surveys proceed. Colour-colour diagrams are useful tools to identify classes of star and provide large samples. However, combining all photometric measurements of a star into a spectral energy distribution will allow quantitative analyses t…
Thermal Evolution of the Nucleus of the Comet 67P for 120 Years: Numerical Simulations
Rusol, Andrey V.; Dorofeeva, Vera A.
The purpose of this paper is to estimate to what temperatures and to what depth the outer layers of the cometary nuclei are heated for several dozen revolutions around the Sun, and what changes in the composition of the volatiles occur in this case. This is important because it is not clear how much the experimentally obtained results on the compo…
Spectral analysis of the He-enriched sdO-star HD 127493
Heber, Ulrich; Dorsch, Matti; Latour, Marilyn
The bright sdO star HD127493 is known to be of mixed H/He composition and excellent archival spectra covering both optical and ultraviolet ranges are available. UV spectra play a key role as they give access to many chemical species that do not show spectral lines in the optical, such as iron and nickel. This encouraged the quantitative spectral a…