Discovery of a new group of double-periodic RR Lyrae stars in the OGLE-IV photometry
Discovery of a new group of double-periodic RR Lyrae stars in the OGLE-IV photometry
Abstract We report the discovery of a new group of double-periodic RR Lyrae stars from the analysis of the Optical Gravitational Lensing Experiment - IV (OGLE-IV) Galactic bulge photometry. In 11 stars identified in the OGLE catalogue as first overtone pulsators (RRc stars), we detect additional longer period variability of …