Time-resolved optical observations of five cataclysmic variables detected by INTEGRAL

TL;DR

This study presents time-resolved optical observations of five cataclysmic variables detected by INTEGRAL, revealing white dwarf spin modulations in three systems and providing spectroscopic orbital periods, thereby enhancing understanding of these rare CVs.

Contribution

The paper provides the first detailed optical timing and spectroscopic data for five INTEGRAL-discovered CVs, clarifying their magnetic properties and orbital periods.

Findings

White dwarf spin modulation detected in three CVs

Two CVs show no evidence of magnetism

Orbital periods measured for four systems

Abstract

The ESA gamma-ray telescope, INTEGRAL, is detecting relatively more intrinsically rare cataclysmic variables (CVs) than were found by surveys at lower energies. Specifically, a large fraction of the CVs that are INTEGRAL sources consists of asynchronous polars and intermediate polars (IPs). IP classifications have been proposed for the majority of CVs discovered by INTEGRAL, but, in many cases, there is very little known about these systems. In order to address this, I present time-resolved optical data of five CVs discovered through INTEGRAL observations. The white dwarf spin modulation is detected in high-speed photometry of three of the new CVs (IGR J15094-6649, IGR J16500-3307, and IGR J17195-4100), but two others (XSS J12270-4859 and IGR J16167-4957) show no evidence of magnetism, and should be considered unclassified systems. Spectroscopic orbital period (P_orb) measurements are also given for IGR J15094-6649, IGR J16167-4957, IGR J16500-3307, and IGR J17195-4100.