3 citations
7 papers
A test for the universality of extinction curve shape
Anna Geminale, Piotr Popowski
We present an analysis of 436 lines of sight with extinction data covering wavelength range from near-infrared (NIR) to ultraviolet (UV). We use J, H, K photometry from 2MASS datab…
Magnetic Fields in Clusters of Galaxies
Torsten A. Ensslin, Corina Vogt, Christoph Pfrommer
A brief overview about our knowledge on galaxy cluster magnetic fields is provided. Emphasize is given to the mutual dependence of our knowledge on relativistic particles in galaxy…
Extragalactic Cosmic Rays and Magnetic Fields: Facts and Fiction
Torsten Ensslin
A critical discussion of our knowledge about extragalactic cosmic rays and magnetic fields is attempted. What do we know for sure? What are our prejudices? How do we confront our m…
X-ray variability, viscous time scale and Lindblad resonances in LMXBs
M. Gilfanov, V. Arefiev
Based on RXTE/ASM and EXOSAT/ME data we studied X-ray variability of persistent LMXBs in the 1e-8 - 1e-1 Hz frequency range, aiming to detect features in their power density spectr…
Total to Selective Extinction Ratios and Visual Extinctions from Ultraviolet Data
Anna Geminale, Piotr Popowski
We present determinations of the total to selective extinction ratio R_V and visual extinction A_V values for Milky Way stars using ultraviolet color excesses. We extend the analys…
[O I] 6300 A Emission from Disks Around Herbig Ae/Be Stars
M. E. van den Ancker, B. Acke, C. P. Dullemond
We present high spectral-resolution optical spectra of 49 Herbig Ae/Be stars in a search for the [O I] 6300.2 A line. The vast majority of the stars in our sample show narrow (FWHM…