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Cluster AgeS Experiment (CASE): Dwarf Novae and a Probable Microlensing Event in the Globular Cluster M22

Pietrukowicz, P.; Thompson, I. B.; Schwarzenberg-Czerny, A. +4 more

We report the identification of a new cataclysmic variable (denoted as CV2) and a probable microlensing event in the field of the globular cluster M22. Two outbursts were observed for CV2. During one of them superhumps with P_sh=0.0887 d were present in the light curve. CV2 has an X-ray counterpart detected by XMM-Newton. A very likely microlensin…

SX Phoenicis Stars in the Globular Cluster M 13

Kopacki, G.

We present results of the search for SX Phe stars in the globular cluster M 13. In photometric reductions we used the image subtraction method supplemented with procedure of searching for short-period variable stars, based on the examination of each pixel in the CCD frames. We illustrate also the ability of this approach to find variability with s…