  We report on a systematic search for X-ray emission from pre-main sequence
and young main sequence stars in the Taurus-Auriga-Perseus region. Our stellar
sample consists of all T Tauri stars from the Taurus-Auriga region, and all
late-type stars from the Pleiades and Hyades clusters which have been observed
by the ROSAT PSPC in pointed observations. We present the X-ray parameters for
all observed stars in tables, and study the connection between coronal X-ray
activity and stellar parameters for different subgroups of our sample. In
particular we compile X-ray luminosity functions (XLF), and discuss the
relations between X-ray emission and spectral type, age, and rotation, on the
largest sample so far.

Astrophysics