The Irregular Variable Ku Her: The Light And Period Variations

TL;DR

This study analyzes eight years of photometric data of the irregular variable KU Her, revealing multiple periodicities and complex light variations, contributing to understanding its variability behavior.

Contribution

It provides a detailed period analysis of KU Her using extensive observational data, identifying multiple fundamental and harmonic periods.

Findings

Identification of five main periods and three harmonic periods.

Detection of complex, multi-periodic light variations.

Analysis of colour variations associated with brightness changes.

Abstract

We present CCD photometric observations of the slow irregular type variable KU Her. We have also used observations from the ASAS Database and the AAVSO International Database. The V-band observations span eight years from August of 2002 to September of 2010. The length and density of the data enable us to look for variations on time scales ranging from days to years. The V-band observations of KU Her are analysed to derive periodicity. This analysis was an approach to find the fundamental periods of the variability of KU Her. Analysis of the KU Her light variation indicates a complex combination of different periods. Five main and three harmonic periods are identified. In addition to the period analysis, we present the colour variations of the star.