Poster Abstracts

Name/Affiliation:  Marcin Kiraga (Warsaw University Observatory)

Title:  Rotation period - X-ray activity relations based on ASAS and ROSAT data

There is ongoing search for periodic variability of stars related to ROSAT X-ray sources in the ASAS photometric data. We present rotation period - X-ray activity relations for all coronally active variable stars found so far in our project (more than 3500) and for different luminosity classes of stars selected using known spectroscopic data and known parallaxes (main sequence, subgiant and giant stars).