We presented light curves for 141 variable stars from the
field of 
Cen. Of these stars 33 objects are new discoveries.
Most of the sample consists of cluster RR Lyr
stars but it includes also 9 brighter objects which are either BL Her stars
or anomalous Cepheids.
One background RR Lyr star located far away behind
the cluster was discovered. We identified also a faint red variable
whose light curve varies with a period 
days. The nature and
membership status of that star require further study.
Large fraction of newly discovered cluster RR Lyr stars are
variables with relatively low amplitudes of light variations.
Also 2 out of 3 newly identified Pop. II Cepheids show light variations
with full amplitude not exceeding 0.2 magnitude.
We note that none
of BL Her stars or anomalous Cepheids listed in an extensive review by
Nemec et al. (1994) exhibits such a low amplitude of light
variability. Our result suggests that the presently known sample of Pop. II
Cepheids is incomplete in respect to low amplitude variables.
Photometric data reported in this paper may be of interest to researchers interested in studying period variability of RR Lyr stars or Pop. II Cepheids. For a significant fraction of presented sample the quality of derived light curves is sufficient to attempt Fourier decomposition.
Acknowledgements
This project was supported by NSF grants AST-9530478 and AST-9528096 to Bohdan Paczyński. JK was supported also by the Polish KBN grant 2P03D-008-08.