X ray spectral variability in Seyfert 1 galaxies

X ray spectrum and variability of MRK 509 as observed with EXOSAT and GINGA

X ray studies of the Hyades cluster

X ray timing and spectral measurements of the X ray pulsar 4U 1538-52

X ray timing observations and gravitational physics

X ray variability of active galactic nuclei

X raying the interstellar dust

X rays emitted by a fast charge on individual atoms and molecules

X Rays from Collisions of Stars.

X Rays from Coronal Condensations and the Development of Active Regions.

X Rays from Coronal Condensations and the Development of Active Regions.

X rays from G54.1+0.3

X rays from old open clusters: M 67 and NGC 188

X rays from radio binaries

X rays from supernova remnants

X rays from the accretion column of compact objects: A Monte Carlo study

X Rays From the Local Bubble

X rays from Wolf-Rayet binaries

X rays predicted from flares of UV Ceti stars

X Vulpeculae