The Blazhko behavior of RV UMa

TL;DR

This study analyzes over 90 years of photometric data on RV UMa, revealing variable pulsation and modulation periods and an inverse relation between them, enhancing understanding of Blazhko behavior in RR Lyrae stars.

Contribution

It provides a comprehensive re-analysis of long-term observations of RV UMa, including unpublished data, and identifies a notable inverse relation between pulsation and modulation periods.

Findings

Periods of pulsation and modulation vary over time.

An inverse relation exists between pulsation and modulation periods.

Long-term data enhances understanding of Blazhko behavior.

Abstract

RV UMa is one of the most extensively studied RR Lyrae stars showing Blazhko modulation. Its photometric observations cover more than 90 years. The published photoelectric observations of RV UMa obtained at the Konkoly Observatory (Kanyo, 1976) were re-considered and completed with previously unpublished data. During the time interval of the observations the periods of both the pulsation and the modulation varied within the ranges of 0.000007 and 0.9 days, respectively. We have found a definite but not strict inverse relation between the pulsation and modulation periods of RV UMa.