V0784 Ophiuchi: an RR Lyrae star with multiple Blazhko modulations

TL;DR

This study reports the discovery of multiple Blazhko modulations in the RR Lyrae star V0784 Ophiuchi, revealing complex multi-periodic behavior through two years of observational data.

Contribution

First detection of multi-periodic Blazhko effects in V0784 Ophiuchi, expanding understanding of modulation phenomena in RR Lyrae stars.

Findings

Main Blazhko period of 24.51 days identified

Secondary Blazhko periods of 34.29 and 31.07 days found

Triplet Fourier structures observed near Blazhko frequencies

Abstract

The results of an observation campaign of V0784 Ophiuchi over a time span of two years have revealed a multi-periodic Blazhko effect. A Blazhko effect for V0784 Ophiuchi has not been reported previously. From the observed light curves, 60 pulsation maxima have been measured. The Fourier analyses of the (O-C) values and of magnitudes at maximum light have revealed a main Blazhko period of 24.51 days but also two other secondary Blazhko modulations with periods of 34.29 and 31.07 days. A complete light curve Fourier analysis with PERIOD04 has shown triplet structures based on main and secondary Blazhko frequencies close to the reciprocal of Blazhko periods measured from the 60 pulsation maxima.