Abstract
We report the results of our study of lightcurve modulation in a sample of 493 RR1 variables from the OGLE-III survey of galactic bulge fields. Each object in this list has 1500 or more I-band observations. We compare our findings with earlier studies regarding lightcurve modulation in LMC and galactic field RR1 stars. We also report the discovery of the modulated-Blazhko RR1 star OGLE-BLG-RRLYR-03825 which has a Blazhko period of 16.469 d which itself is modulated with a period of 339.2 d.
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