X-ray absorption, interstellar reddening, and elemental abundances in the interstellar medium

X-ray accretion signatures in the close CTTS binary V4046 Sgr

X-ray active galactic nuclei in the core of the Perseus cluster

X-ray activities in a Young Open Cluster: Chandra Observations of NGC2516

X-ray Activity and Accretion in Young Stellar Objects

X-ray Activity and Close-in Giant Planets

X-ray activity and evolutionary status of late-type giants

X-ray activity and rotation of the young stars in IC 348

X-Ray Activity and Rotation on Bright Late-Type Giants and Supergiants

X-ray activity cycles in stellar coronae

X-Ray Activity in Cygnus and Aquila

X-ray activity in GX 339-4

X-Ray Activity in Near-Contact Binary Stars

X-ray activity in pre-main sequence stars

X-ray activity in T-Tauri stellar magnetospheres

X-Ray Activity in the Open Cluster IC 4665

X-ray activity of IGR J17379-3747 confirmed with INTEGRAL

X-ray activity phased with planet motion in HD 189733?

X-ray afterglow detection of the short gamma-ray burst 991014

X-ray afterglow from GRB011211 as observed with XMM-Newton.